单项选择题

How long ______ since I bumped into you and your sister at McDonald

A．is it
B．was it
C．had it been
D．has it been
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单项选择题
The rescue was ______ after several abortive attempts because the snowstorm was getting worse.
A．deserted
B．abandoned
C．ceased
D．rejected
单项选择题
Many local people were deeply concerned about the nuclear leakage, ______ was still kept secret.
A．the cause of that
B．and the cause of which
C．the cause of which
D．which cause
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