【題目】Look! The shapes（形狀）of the clouds _______. They were like horses just now.

A. changeB. are changingC. were changingD. have changed

【答案】D

【解析】

句意：看，云的形狀改變了，剛才看起來(lái)像馬。根據(jù)句意可知，動(dòng)作發(fā)生在過(guò)去，對(duì)現(xiàn)在造成影響（和剛才不一樣了），所以用現(xiàn)在完成時(shí)，結(jié)構(gòu)是主語(yǔ)+ have/has+過(guò)去分詞，故選D。

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