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
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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
单项选择题
They left at nine, so they ______ by now.
A. may arrive


B. must arrive
C. should have arrived

D. ought to arrive
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