A search in the NOW corpus for:
at_II _AT1 _NN
1 AT A TIME 475982
2 AT A PRESS 98426
3 AT A COST 80801
4 AT A MEETING 65340
5 AT A NEWS 61714
6 AT A PRICE 54148
7 AT AN EVENT 49461
8 AT A CAGR 44712
9 AT A RATE 41236
10 AT A HOSPITAL 29435
11 AT AN AVERAGE 27037
12 AT A LOSS 25621
13 AT A RALLY 25206
14 AT A CEREMONY 23061
15 AT A PARTY 22804
16 AT A POINT 22709
17 AT A HOTEL 19313
18 AT A GLANCE 19019
A picture shows me at a glance what it takes dozens of pages of a book to expound.
19 AT A DISTANCE 18648
20 AT A RESTAURANT 18108
21 AT EVERY LEVEL 18095
22 AT A CONFERENCE 17644
23 AT A HOUSE 17452
24 AT EVERY TURN 16368
25 AT A MINIMUM 15684
26 AT A MEDIA 15403
27 AT A DISCOUNT 15171
28 AT A HOME 14977
29 AT A SCHOOL 14384
30 AT A DISADVANTAGE 14199
lt seems you have me at a disadvantage.
31 AT A PREMIUM 14152
32 AT A NUMBER 14024
33 AT A MOMENT 13885
34 AT A LEVEL 12459
35 AT A HEARING 11961
36 AT A BAR 10912
37 AT A RECORD 10659
38 AT A PLACE 10551
39 AT EVERY STAGE 10314
40 AT A CROSSROADS 9997
41 AT A BRIEFING 9617
42 AT A FUNCTION 9594
43 AT A FRACTION 9370
44 AT A TABLE 9294
45 AT EVERY OPPORTUNITY 9284
46 AT A SPEED 8815
47 AT A CLUB 8373
48 AT A POLICE 8245
49 AT A POLLING 8242
50 AT A DINNER 8225
51 AT A CAMPAIGN 8072
52 AT A DEPTH 7921
53 AT A WORLD 7758
54 AT AN APARTMENT 7335
55 AT EVERY STEP 7266
56 AT A COMMUNITY 7185
57 AT A PACE 7184
58 AT A FRIEND 7150
59 AT A UNIVERSITY 6584
60 AT A CHURCH 6562
61 AT AN ALTITUDE 6527
62 AT A STANDSTILL 6486
63 AT A STATE 6343
64 AT A WEDDING 6321
65 AT A MEMORIAL 6146
66 AT A PROTEST 6102
67 AT A BUS 6069
68 AT AN AIRPORT 5882
69 AT A GAS 5834
70 AT A COMPOUND 5728
71 AT A COMPANY 5725
72 AT A CITY 5606
73 AT A SEMINAR 5554
74 AT A GOVERNMENT 5480
75 AT A SUMMIT 5448
76 AT A SITE 5425
77 AT A CONCERT 5410
78 AT A FORUM 5401
79 AT A RESIDENCE 5280
80 AT A BUSINESS 5250
81 AT A STAGE 5246
82 AT A MARKET 5173
83 AT A CHECKPOINT 5149
84 AT A LOT 5125
85 AT A LOCATION 4939
86 AT A GALA 4931
87 AT A GAME 4885
88 AT A RECEPTION 4735
89 AT AN END 4619
90 AT A FAMILY 4599
91 AT A TOWN 4574
92 AT AN ADDRESS 4570
93 AT A RANGE 4547
94 AT AN ANGLE 4524
95 AT AN AGE 4514
96 AT AN AUCTION 4493
97 AT A FUNERAL 4482
98 AT A DESK 4439
99 AT A STORE 4438
100 AT A PARK 4360