单项选择题

By the end of last year we ______ over 2,000 English phrases.

A. have learned
B.learned
C. wiU have learned
D. had learned

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单项选择题

______ the meat on the gas cooker, he began to watch TV.

A. Put
B. Putting
C. Being put
D. Having put

单项选择题

There has been some ______ of entry into American schools to Chinese students.

A. limit
B. restriction
C. confine

D. imprisonment

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