单项选择题

（） his return from Japan, Prof. Li went directly to his laboratory and started working with his colleagues.

A. Upon
B. At
C. Within
D. Over

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The goals （） he had fought all his life no longer seemed important to him.

A. after which
B. for which
C. with which
D. at which
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I guess the rain （） by tomorrow noon.

A. will be stopping
B. will have stopped
C. will stop
D. will have been stopping
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