______is often the case with a new idea, more conditions should be considered.

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问题 ______is often the case with a new idea, more conditions should be considered.

选项 A、It
B、Which
C、As
D、That

答案C

解析 本题考查定语从句。句意:通常情况下,一个新的想法要考虑更多的情况。该句为非限制性定语从句,先行词为后面的整个句子,as可提至句首。which也可引导非限制性定语从句,但它不能位于句首,故排除。所以本题选C。
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