单项选择题

It is necessary that anyone ______ exercises every day if he wishes to keep healthy.

A．would do
B．will do
C．did
D．do
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单项选择题
John's completely unaware how much damage he did the company, ______
A．didn't he
B．did he
C．isn't he
D．is he
单项选择题
Whatever you do, you ______ click with the right mouse button or the program will crash.
A．must not
B．don't have to
C．doesn't have to
D．needn't
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