单项选择题

(Witnesses) of the crime (find difficult) to explain (why) they (didn't) call the police.

A．Witnesses
B．find difficult
C．why
D．didn't
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单项选择题
(Alcoholics) have a death rate nearly three times more than (the general population); they are (seven times) more likely than non-alcoholics to (suffer) fatal accidents.
A．Alcoholics
B．the general population
C．seven times
D．suffer
单项选择题
A (more sophisticated) analysis shows that an expansion (rather than) a boycott of wood products is (that) we really ought to (be after).
A．more sophisticated
B．rather than
C．that
D．be after
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