题目内容

______ steel is stronger than iron, men are able to make steel pipes with larger diameters.

A. While
B. If
C. Unless
D. As

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Mr. Chen said that he would be punctual for the appointment, ______ he were late?

A. but what if
B. how about
C. so what
D. and what about

Mrs. Lee will move into her new house next Monday, ______ it will be completely furnished.

A. by which time
B. by the time
C. by that time
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A. although
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A. energy that
B. that it is energy
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