单项选择题

Had I run out of gas, I ought to have called the garage（）.

A．had
B．would have
C．would
D．should have

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单项选择题

I knew nothing of the motives behind his recent move,and I don''t know either the person to put him up to the action（）.

A．nor did I know ... who
B．not did I know ... that
C．nor do I know ... that
D．either did I know ... who

单项选择题

Erosion that is a slow process, but it constantly changes the features on the surface of the earth（）.

A．which is
B．although
C．being
D．is

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