单项选择题
— I will be right back in an hour. Will you wait for me
— I'm afraid not. He probably have gone to a meeting () then.
A.by
B.since
C.from
D.till
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单项选择题
The teacher said that the heavy object () at the same speed as the light one.
A.fall
B.fell
C.falls
D.is falling
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单项选择题
As () known to all, language has been developed through social contacts.
A.is
B.are
C.though
D.if
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