Question

Mr White went to China ________ the morning of August 15．

1. A.
   in
2. B.
   at
3. C.
   on
4. D.
   for

Answer 1

C
解析：
通常我们说in the morning, in the afternoon, in the evening, at night但是当说到某个具体的早上，下午，晚上时用介词on，例如：on a winter morning, on Sunday afternoon, on a windy evening, on the night of May 5．