_______ is often the case, we have worked out the production plan.?
A．WhichB．When?
C．WhatD．As?
D?
此題考查as位于句首引導(dǎo)定語從句的用法。as 可引導(dǎo)非限制性定語從句，指代其前面或后面的整個句子，而which只能指代前句，不能用于句首。
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