__________ has already been pointed out, grammar is not a set of dead rules.
A．As　　　B．It　　C．That　D．Which
A
定語(yǔ)從句。根據(jù)后面的逗號(hào)可知，此處為非限制性定語(yǔ)從句，放句首的只能選擇as
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