单项选择题

The hole in the wall is large enough for a bird to fly through without touching ______.

A．either wing
B．each of their wings
C．any wing
D．both of the wings
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单项选择题
You needn't describe her. I ______ her several times.
A．had met
B．have met
C．met
D．meet
单项选择题
It's nearly eight o'clock. John ______ be here at any moment.
A．must
B．need
C．should
D．can
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