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
It is reported that crimes are most likely to happen in cities ______ a large percentage of unemployment.
A．which they have
B．that having
C．that have
D．where have
单项选择题
His homework ______, John went back home.
A．having finished
B．finishing
C．had been finished
D．having been finished
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