单项选择题

Encouragement is sometimes much more ______ than criticism.

A．effective
B．efficient
C．executive
D．extensive
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单项选择题
______ the first to use nuclear weapons.
A．At no time China will be
B．Never China will be
C．Will China never be
D．At no time will China be
单项选择题
“That latest car must have cost you a pretty penny.” “Oh, no, ______ .”
A．it didn’t
B．it mustn’t
C．it hasn’t
D．it must haven’t
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