单项选择题

Mr. Smith kept on (studying) Chinese and (use) it (until) he (had mastered) it.()

A. studying
B. use
C. until
D. had mastered

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单项选择题

A.reuse
B.reread
C.rewrite
D.recite

单项选择题

If I (worked) (with him) last year, I (would) have got on very (well) with him.()

A. worked
B. with him
C. would
D. well

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