题目内容

Someone must have left the tap on, ______ the water was running over and flooding the bathroom.

A. for
B. moreover
C. nevertheless
D. therefore

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Human behavior is mostly a product of learning, ______ the behavior of animal depends mainly on instinct.

A. whereas
B. so
C. unless
D. that

the Europeans knew what compass was, the Chinese had put it into practical use.

A. Before long
B. Long since
C. Long ago
D. Long before

She thought I was talking about her daughter, ______ in fact I was talking about my daughter.

A. because
B. unless
C. while
D. therefore

He hasn’t yet arrived. He may, ______, come later.

A. but
B. if
C. or
D. however

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