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

A.

【解析】

試題分析：考查過去分詞做定語。這里的involved相當(dāng)于which is involved，which is 可省略。并且此題考查了動(dòng)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(xiàng)如此重要的項(xiàng)目所花費(fèi)的時(shí)間和努力是值得的。故選A。

考點(diǎn)：考查過去分詞做定語。

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