单项选择题

It looks（）the family has got a lot of problems.

A. as long as
B. as if
C. while
D. though

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

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

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

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

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