1-6. In the face of widespread concern about environemntal waste, compact disc manufacturers are attempting to find a repalcement for the disposable plastic box in which they package their product.
athe disposalble plastic box in which they
B. the disposable plastic box where they
C. a disposable plastic box in which to
D. disposable plastic boxes inside which they
E. the disposable plastic boxes in which to
答案：A
请问，a ,e的区别在哪里？e为何错误?
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