It is common knowledge that cotton cloth, ______ in hot water, tends to shrink.

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问题 It is common knowledge that cotton cloth, ______ in hot water, tends to shrink.

选项 A、it is washed
B、when washed
C、washing
D、to be washed

答案B

解析 本句为that引导的同位语从句,从句部分又是一个从句省略掉了it is的状语从句。其中it所指代的cotton cloth与wash构成被动关系,因此wash应该用过去分词形式表示被动。例如:When(it is)heated,water can be turned into vapor.水受热会变成蒸汽。
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