单项选择题

Tom looks so pale today. He （）ill.

A. must be
B. had to be
C. should be
D. shall be

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It is nice to go for a walk（）a summer evening.

A. on
B. during
C. in
D. at
单项选择题
（）your help we were successful.

A. According to
B. But for
C. Owing to
D. As for
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