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

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单项选择题

A man cannot smile like a child, ______ a child smiles with his eyes, while a man smiles with his lips alone.

A. so
B. but
C. and
D. for

单项选择题

So badly ______ in the car accident that he had to stay in hospital for several weeks.

A. did he injure
B. he injure
C. was he injured
D. he was injured

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