单项选择题

It's (high) time they (begin) to take you seriously (and) they know (it).

A．high
B．begin
C．and
D．it
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单项选择题
No sooner (had) the hikers (set out) on their trip (as) it began to rain (heavily).
A．had
B．set out
C．as
D．heavily
单项选择题
Mark Twain is a good (representative) (of) post-Civil War authors because of his (place) of birth, education, and (how he wrote).
A．representative
B．of
C．place
D．how he wrote
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