单项选择题

By the late 1950s scientists had already __________ enough evidence to show a clear link between smoking and cancer.

A．assembled
B．proved
C．acquired
D．accumulated
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单项选择题
Within days of being appointed office manager he had __________ his own working methods on the staff.
A．compelled
B．imposed
C．opposed
D．compressed
单项选择题
Countless divorced politicians would have been elected out of office years ago had they even thought of a divorce, __________ gotten one.
A．leave alone
B．leave behind
C．let alone
D．let down
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