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单项选择题

Doctors believe that lung cancer is caused ______ by smoking too much.

A. part
B. at part
C. in part
D. with part

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热门试题

单项选择题______, you'll accomplish nothing.

A. Without work hard
B. With working hard
C. Without working hard
D. Not work hard

单项选择题He orders me about ______ my boss.

A. as he is
B. as if he be
C. as if he were
D. as if to be