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When , the water changes into vapour.A.heatingB.to heatC.heatedD.is heated

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When , the water changes into vapour.A.heatingB.to heatC.heatedD.is heated

When _________, the water changes into vapour.

A.heating

B.to heat

C.heated

D.is heated

试题答案

C

前半句可还原为“When it is heated”。