问题
选择题
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
答案
答案：A
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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
答案：A