单项选择题
Hardly ______ entered the classroom when the bell began to ring.
- A．he has
B．has he
C．he had
D．had he
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Women workers wear hats ______ their hair gets caught in the machine.
A．if
B．in case
C．unless
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单项选择题
It was Professor Smith ______ did the experiment in the lab yesterday evening.
A．whom
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