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

Of the three common salicylates,_______.

A．the preference of aspirin for most therapeutic uses.
B．for most therapeutic uses aspirin preferred
C．preferring aspirin for most therapeutic used
D．aspirin is preferred for most therapeutic uses

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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