单项选择题

The business of doctors is to prevent and () disease.

A. kill
B. cure
C. wound
D. injure

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单项选择题

The twins are so much () that it is difficult to tell one from the other.

A. similar
B. equal
C. like
D. alike

单项选择题

We could do nothing but () till he came back.

A. to wait
B. waiting
C. wait
D. waited

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