______ is worth doing well.
A．Whatever is worth doing at allB．That is worth doing at all
C．What is worth doing at allD．Whatever is worth doing it at all
A
考查名詞性從句。主語whatever is worth doing，這是一個(gè)名詞性從句相當(dāng)anything that is worth doing 意為“任何值得去做的事情”。表語worth doing well. 這是一個(gè)介詞短語，worth是介詞，所以后跟動(dòng)名詞作賓語。句意：任何值得去做的事情都值得去做好。
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