单项选择题

Many a student ______ the usage of the word since the teacher explained it last time.

A．have grasped
B．grasped
C．had grasped
D．has grasped
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单项选择题
They left three hours ago; they ______ there by now.
A．must arrive
B．can arrive
C．must have arrived
D．will arrive
单项选择题
I expressed hope ______ they would come to visit China again.
A．that
B．as
C．although
D．whether
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