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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The period during (when) people (learned to) smelt iron is (called) (the) Iron Age.
A. when
B. learned to
C. called
D. the
单项选择题
John is not (enough intelligent) (to pass) (this) (economics) class without help.
A. enough intelligent
B. to pass
C. this
D. economics
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