Salt is a substance that ______ in water.

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问题 Salt is a substance that ______ in water.

选项 A、dissolve easy
B、dissolve easily
C、dissolving very easy
D、dissolves easily

答案D

解析 表语substance 由that 引导的定语从句修饰,空格处需填从句的谓语,且 substance是单数,依据从句主谓一致原则,动词也应是单数。
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