单项选择题

_____ the earth to be flat, people feared that Columbus would fall off the edge of the earth.

A．Having believed
B．To believe
C．Believing
D．Believed
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单项选择题
_____ we go by train or by boat makes no difference.
A．If
B．When
C．Whether
D．That
单项选择题
It was not _____ she had arrived home _____ she remembered she had forgotten her suitcase in the hotel.
A．until; when
B．when; then
C．when; that
D．until; that
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