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
Though computer has many advantages, it is by no means without its _________.
A．limitations
B．refrain
C．confinements
D．boundaries
单项选择题
_________ the earth to be flat, many feared that Columbus would fall off the edge of the earth.
A．Having believed
B．Believed
C．Believing
D．Being believed
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