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
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(In order to) get married in this state, one (must) present a medical report (along with) (your) identification.
A. In order to
B. must
C. along with
D. your
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My father (enjoys) fresh (air), (sunshine), and (to take) long walks.
A. enjoys
B. air
C. sunshine
D. to take
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