单项选择题

Lily’s father scolded her and made her promise （）again.

A．never to do that
B． never to do what
C．never doing that
D．never doing what

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单项选择题
He doesn’t understand （）so early in the morning.

A．why to start
B． why start
C．why to starting
D．why they should be start
单项选择题
You have failed several times. Why not （）some other way

A．try doing it
B．to try to do it
C．that you try it
D．having tried
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