If ____ to a high temperature, a piece of ice will turn into water.

 

  A. hearing B. to heat C. heats D. heated

 

 

D

本題考查了省略。If heated等于If it is heated。在時間狀語從句、條件狀語從句、讓步狀語從句或方式狀語從句中,如果主句的主語與從句的主語相一致,謂語含有動詞be,可以省略主語與動詞be。

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