单项选择题

It was not until 1936 ______ baseball became a regular part of Olympic Games.

A. then
B. which
C. that
D. when
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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
单项选择题
He suggested that they ______ use a trick instead of fighting.
A. should
B. would
C. do
D. had
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