单项选择题

I like （）the clouds at sunset because it seems relaxing.

A. watch
B. to watch
C. watched
D. watching

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单项选择题

I've worked here since I （） Harvard Business School.

A. leave
B. left
C. have left
D. had left

单项选择题

Please fill（）this online application form.

A. up
B. on
C. out
D. with

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