单项选择题

We are fortunate ______ several descriptive papers have been published which give adequate background and experimental results.

A．in which
B．so that
C．as if
D．in that
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单项选择题
The child ______ his clothes and rushed out.
A．grabbed
B．graded
C．paused
D．pointed
单项选择题
Strike ______ the iron is hot.
A．if
B．when
C．as
D．while
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