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