单项选择题

案例分析题 （56）处应填写（）

A．all
B．and
C．but
D．to

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I think (that) the day (will) finally come (that) air pollution can be put (C) control.
A．that
B．will
C．that
D．under
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Only (when) the war was over in 1918 (he was) able to (get) happily back (to) work.
A．when
B．he was
C．get
D．to
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