单项选择题

It is important that you______ to the dean before leaving for your vacation.

A. speak

B. spoken
C. have spoken

D. speaks

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单项选择题

Only after he has acquired considerable facility in speaking ______ to learn to read and to write.

A. he began

B. will he begin
C. did he begin

D. must he begin

单项选择题

Many visitors praised the magnificent architecture of the Palace ______ the Forbidden City.

A. known to foreigners for

B. known to foreigners as
C. known for foreigners to be
D. known for foreigners as

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