单项选择题

There ______ no rain, the ground was dry.

A．would have been
B．having been
C．had been
D．was
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单项选择题
Do you still remember ______ to Professor Lee during last visit
A．to have introduced
B．having introduced
C．to introduce
D．being introduced
单项选择题
Please tell him that he can dial 110 ______ emergency.
A．in the case
B．in a case of
C．in case
D．in case of
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