The paper will become useless ___ into pieces .A.after tearing B.when being torn C.unless being torn D.when torn

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The paper will become useless ___ into pieces .A.after tearing B.when being torn C.unless being torn D.when torn

The paper will become useless ___ into pieces .A.after tearing B.when being torn C.unless being torn D.when torn
The paper will become useless ___ into pieces .
A.after tearing B.when being torn C.unless being torn D.when torn

The paper will become useless ___ into pieces .A.after tearing B.when being torn C.unless being torn D.when torn
(D) The paper will become useless when torn into pieces.可以看成 ...when it is torn into pieces.的省略,是被动,when 相当于 if,这些大家都说了.那么同样是被动,为什么就不能选 B 那是时态的问题.简单的 torn,除了被动以外,还有过去或完成的意思,而 being torn,就是被动加现在或进行中的意思.纸是被撕碎了以后变得没用,所以用 torn 比 being torn 合适.选项A 是主动态,选项 C 用了 "除非",语义错误,都不用考虑.