单项选择题

Mike didn’t start ______ the importance of a foreign language till he graduated from school.

A. knowing
B. to know
C. know
D. to have known
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单项选择题
He suggested that they ______ use a trick instead of fighting.
A. should
B. would
C. do
D. had
单项选择题
He was ______ today, but was asked to stay for ______ week.
A. to have returned; another
B. returning; one more
C. returned; another

D. to return; other
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