单项选择题

To drive a car safely, it is ______ good brakes.

A．essential with
B．essential having
C．essential to have
D．essential have
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单项选择题
They will never reconcile themselves to ______.
A．defeat
B．their defeat
C．be defeated
D．have their defeat
单项选择题
The back garden of our house contains a lawn, ______ very pleasant to sit on in summer.
A．which is
B．which it is
C．it is
D．where it is
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