单项选择题

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

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

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单项选择题
不同的一项是（）

A. adverb
B. birthday
C. curtain
D. cigar
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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