问题
The importance of saving gas________be stressed too much.Automobiles use up some 70 billion gallons of gas a year.[ ]
A:can’t
B:mustn’t
C:shouldn’t
D:may not
B:mustn’t
C:shouldn’t
D:may not
正确答案是：
同类题型
_______made Daisy wild with joy—Her success in the A-level exam this year.
I don’t know whether you happen ____ that he has been away for two months.[ ]
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He seems too tired today, and I wonder he got a good sleep last night.
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