单项选择题

______ the cause, they were able to propose to a remedy.

A．Found
B．Having found
C．Have found
D．Having been found
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单项选择题
I have not gone to see the doctor for a long time, but today______
A．I'm going to
B．I'm going to see
C．I'm going
D．I go
单项选择题
I ______ half an hour before she came out of the telephone box and I entered.
A．waited
B．have waited
C．had been waiting
D．was waiting
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