Although the huge engine as tall as 25 meters is heavy it is powerful and works well. A

问题补充：

Although the huge engine, as tall as 25 meters, is heavy, it is powerful and works well.

A. carried

B. to be carried

C. to carry

D. being exposed

答案：

A. carried

B. to be carried

(答案→)C. to carry

D. being exposed

解析： sth+be+adj.+to do结构中，习惯于用不定式的主动形式表被动含义，所以选C。句意：尽管这个巨大的机器，高达25米，很难搬动，但是它很有力量，运转的很好。

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