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．Believing
C．Believed
D．Being believed
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单项选择题
When I saw her facial ______ I knew she was angry.
A．appearance
B．expression
C．looking
D．feeling
单项选择题
An investigation was made into the accident, ______ fifty people were killed.
A．for that
B．when
C．where
D．in which
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