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_______ is often the case, we have worked out the production plan.?
A.WhichB.When?
C.WhatD.As?
D?
此题考查as位于句首引导定语从句的用法。as 可引导非限制性定语从句,指代其前面或后面的整个句子,而which只能指代前句,不能用于句首。
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