单项选择题
We didn’t know what to do （） the money had gone.
A．once
B．whether
C．though
D．then
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单项选择题
It is strongly recommended that teachers _______ computers in their teaching.
A．will use
B．shall use
C．use
D．used
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单项选择题
The more careful they are, _______.
A．the less mistakes will they make
B．the less mistakes they’ll make
C．the fewer mistakes will they make
D．the fewer mistakes they’ll make
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