问题

Some people________feel sick when they read a book in a car or on a boat.
A:must
B:should
C:may
D:need;
B:should
C:may
D:need;
正确答案是:
同类题型
Tony is a quiet student, he is active in class.
We have been friends for nearly twenty years. Nothing can break off our _______.
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Do you think Jim will pass theChemistry exam—-Sure. He ______a lot of time on it.