单项选择题

Only when (he realized) that there (would be) more (difficulties) ahead than he expected (he came to) me for help.

A．he realized
B．would be
C．difficulties
D．he came to
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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
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
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