单项选择题

The wild flowers looked like a soft orange blanket ______ the desert.

A．covering
B．covered
C．cover
D．to cover

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单项选择题

He had already walked three or four miles ______ he saw a cart, half-full of hay, by the side of the road.

A．while
B．when
C．the moment
D．unless

单项选择题

What a strange man! He loves his wife, but ______ he often beats her.

A．at a time
B．at one time
C．in time
D．at the same time

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