单项选择题


A．if
B．upon
C．as
D．when
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单项选择题
Yesterday's strike caused complete confusion for ______.
A．employers
B．commuters
C．bus drivers
D．tourists
单项选择题
Those were the graduate assistants ______ to do the research work in the lab.
A．to whom it was their responsibility
B．whose responsibility there was
C．whose responsibility was
D．of whom with the responsibility
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