1704923140
at present
1704923141
1704923142
at the moment
1704923143
1704923144
at this time
1704923145
1704923146
at the weekend
1704923147
1704923148
at half past two
1704923149
1704923150
at 3:00
1704923151
1704923152
at the beginning
1704923153
1704923154
at the end of the year
1704923155
1704923156
表示节日和阶段的名词前也可用at：
1704923157
1704923158
at Easter
1704923159
1704923160
at Christmas
1704923161
1704923162
at this stage
1704923163
1704923164
at that period
1704923165
1704923166
在表示较长的一段时间时，多用in：
1704923167
1704923168
in the morning
1704923169
1704923170
in the afternoon
1704923171
1704923172
in the evening
1704923173
1704923174
in the night
1704923175
1704923176
in July
1704923177
1704923178
in 1996
1704923179
1704923180
in one’s youth
1704923181
1704923182
in the 1970s
1704923183
1704923184
in the past
1704923185
1704923186
in the future
1704923187
1704923188
in all these years
1704923189
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