单项选择题

(If) traffic problems are not solved soon, (driving) (in) cities (becomes) impossible.

A．If
B．driving
C．in
D．becomes
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单项选择题
Only (within) the past 200 years (scientists have) found (out what) fire (is).
A．within
B．scientists have
C．out what
D．is
单项选择题
He (kept) his (head); (otherwise) the accident (had happened)
A．kept
B．head
C．otherwise
D．had happened
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