【題目】We believe the time and hard work _______ in completing such an important project are worthwhile.

A．involved B．involving

C．to involve D．to be involved

【答案】A.

【解析】

試題分析：考查過去分詞做定語。這里的involved相當于which is involved，which is 可省略。并且此題考查了動詞詞組be involved in sth涉及到某事。句意為我們相信涉及到完成這項如此重要的項目所花費的時間和努力是值得的。故選A。

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