问题
选择题
__________ has already been pointed out, grammar is not a set of dead rules.
A．As
B．It
C．That
D．Which
答案
答案：A
定语从句。根据后面的逗号可知，此处为非限制性定语从句，放句首的只能选择as
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__________ has already been pointed out, grammar is not a set of dead rules.
A．As
B．It
C．That
D．Which
答案：A
定语从句。根据后面的逗号可知，此处为非限制性定语从句，放句首的只能选择as