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单项选择题

Tom has been in the factory ______ he left school.

A. when

B. since

C. as soon as

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热门试题

单项选择题Paper ______ in China.

A. is invented
B. was invented
C. has invented

单项选择题His father ______ for a week.

A. was died
B. has been dead
C. has died