【題目】—Everyone should use both sides of paper.

—Yes. If we all use both sides of paper, many trees ________ be saved.

A. need B. have to C. can D. must

【答案】C

【解析】句意:——每個人應(yīng)該使用紙的兩面。——是的。如果我們都是用紙的兩面,許多樹能被挽救。need需要,,have to 不得不,can能夠,must 是必須。結(jié)合句意,此處表示能夠挽救很多樹,故用情態(tài)動詞can,故選C。

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