单项选择题

There's no light on they ______ be at home.

A. can't
B. mustn't
C. needn't
D. shouldn't
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单项选择题
Before the drug is used on human beings, experts have to ______ dogs.
A. be experimented
B. experiment
C. experiment with
D. experiment on
单项选择题
We forgot to bring our tickets, but please let us enter, ______
A. do you
B. can we
C. will you
D. shall we
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