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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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
单项选择题
The ancient Egyptians are supposed _________ rockets to the moon.
A．to be sending
B．to send
C．to have sent
D．to have been sending
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