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[单选题]
He was very rude to the customs officer, _____of course made things even worse.
A
who
B
whom
C
what
D
which
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参考答案
试题答案：
D
答案解释：
解题思路：D。本题考查非限定性定语从句。用which来引导非限定性定语从句，并且代替前面句子。
【参考译文】他对海关的官员十分无礼，这让事情变得更加糟糕。
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