【題目】Water turns into steam ________ it boils.

A.whenB.untilC.althoughD.while

【答案】A

【解析】

句意“當(dāng)水燒開(kāi)時(shí),水會(huì)變成蒸汽”。

when當(dāng)……時(shí)候,從句的動(dòng)作和主句的動(dòng)作可以同時(shí)發(fā)生也可以是先后發(fā)生;B.直到(引導(dǎo)時(shí)間狀語(yǔ)從句);C.盡管(引導(dǎo)讓步狀語(yǔ)從句);D.當(dāng)……時(shí)候,強(qiáng)調(diào)主句的動(dòng)作在從句動(dòng)作發(fā)生的過(guò)程中或主從句兩個(gè)動(dòng)作同時(shí)發(fā)生。根據(jù)句意可知,水先燒開(kāi),然后變成蒸汽,故選A

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