问题补充：
The boy dived into the water and after seemed to be a long time, he came up again.
A. what
B. that
C. it
D. which
答案：
(答案→)A. what
B. that
C. it
D. which
解析：句意：男孩跳进水里，过了好像很长时间，他又出来了。After后面接的是宾语从句，宾语从句中缺少主语，用what引导宾语从句，选A。
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