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
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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
单项选择题
One thief went inside while the other waited outside and _________ the police.
A．watched out
B．watched for
C．watched over
D．looked out
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