单选题：ltwasnotuntilmidnight_theyreachedthecampsite.

题目内容：

ltwasnotuntilmidnight_theyreachedthecampsite. A．when
B．that
C．while
D．as

参考答案：

答案解析：

Silveristhebestconductorofelectricity,copper_itclosely.

Silveristhebestconductorofelectricity,copper_itclosely.A．followed B．following C．

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ItcanbeinferredfromthepassagethatA．theApollomissionwasverysuccessful B．protectio

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