【題目】—How kind it was _____ you to look after the dog for me while I was away!

—You’re welcome. It’s necessary _____ us to help each other any time.

A.of; forB.of; ofC.for; ofD.for; for

【答案】A

【解析】

句意：——我不在的時候你還能替我照顧小狗可真好呀！——不客氣。對我們來說隨時互相幫助是有必要的。

考查固定句型。It’s + adj. +of (for) sb to do sth，該類句型是it作形式主語，動詞不定式作邏輯主語。當(dāng)形容詞是描述不定式行為者的性格、品質(zhì)的，用of sb；若形容詞僅是描述事物，不是對不定式行為者的品格進(jìn)行評價的，用for sb。本題“How kind it was _____ you”中的“kind”表示友好的，形容人的品格，故用of sb；“It’s necessary _____ us to help”中的“necessary”表示有必要的，僅描述“隨時互相幫助”這件事是有必要的，應(yīng)用for sb。故選A。

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