问题
On April Fools’ Day, Westerners play tricks on each other on the basis of the rule for the jokes: they ________ be fun and ________ hurt anyone’s feelings.
A:should; oughtn’t
B:can; mustn’t
C:must; shouldn’t
D:need; couldn’t;
B:can; mustn’t
C:must; shouldn’t
D:need; couldn’t;
正确答案是：
同类题型
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