【題目】It's necessary for students to exercise________weekends.

A.onB.forC.in

【答案】A

【解析】

句意:學(xué)生們有必要在周末鍛煉身體。

考查介詞。on表示星期幾或某一特定的日期;for為了;關(guān)于; in泛指一般意義的上午、下午或晚上以及月或年等較長(zhǎng)的時(shí)間。根據(jù)固定用法on weekends 在周末。表示許多星期(表經(jīng)常性)?芍,此空應(yīng)填介詞on,故選A。

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