自考《英语（二）》试题练习：非限制性定语从句（6.12）
单选题
[2009.10]The traffic was held up for more than thirty minutes，______ caused me to arrive late.
A.it
B.that
C.what
D.which
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单选题
[2009.10]The traffic was held up for more than thirty minutes，______ caused me to arrive late.
A.it
B.that
C.what
D.which
