单项选择题

It was not until midnight ______ the snowcapped peak.

A. that they sighted
B. that they did not sight
C. did they sight
D. had they sighted
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单项选择题
Tom went through the documents again carefully for fear of ______ any important dat
a.A. relayingB. overlookingC. deletingD. revealing
单项选择题
As the mountains were covered with a ______ of cloud, we couldn't see their tops.
A. coating
B. film
C. veil
D. shade
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