单项选择题

Most computer users are （） threat from computer viruses.

A．within
B．upon
C．towards
D．under

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单项选择题

“（）everyone’shere,”shesaid,“let’sbegintodiscussit.”

A．As far as
B．Now that
C．So far
D．By far

单项选择题

Thereisalotofevidence（）stressispartlyresponsibleforthedisease.

A．what
B．which
C．as
D．that

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