7.Climbing hills________ good for our health.( 。
A.areB.isC.wasD.were

分析 爬山有益健康.

解答 答案:D 根據(jù)主謂一致原則,動詞短語(climbing hills)作主語按單數(shù)處理,be good for是"對••有好處",客觀事實(shí)應(yīng)用一般現(xiàn)在時態(tài).故選D.

點(diǎn)評 動詞短語作主語需按單數(shù)處理,客觀真理按一般現(xiàn)在時態(tài).

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