题目内容

She wandered whether triangles, which had only three sides, wereas polygons, which she thought of as many-sided.

A. qualified
B. theorized
C. estimated
D. multiplied

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There is no perfect trading system, and each of the proposed ones has its.

A. limits
B. borders
C. frontiers
D. limitations

Henry will not be able to attend the meeting tonight becausea class then.

A. he must be teaching
B. he will be teaching
C. he will have taught
D. of him has to teach

I wish I hadn't been so busy yesterday, otherwise Iyou with the cleaning.

A. will have helped
B. should help
C. could have helped
D. could help

Just as the builder is skilled in the handing of his bricks,the experienced writer is skilled in the handling of his words.

A. as
B. so
C. thus
D. like

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