问题

Something ___ to save our earth. Do you think so?
A:can do
B:must do
C:has to do
D:must be done
B:must do
C:has to do
D:must be done
正确答案是:
同类题型
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The murderer was brought in, with his hands______behind his back.
has done that again — _______ you ask Little Tom, of course!
He is quite sure that it’s __________impossible for him to fulfill the task within two days[ ]