题目内容

There are several factors _______ in the economy _______ make it difficult to predict the future.
A．operate; whereB．operating; whichC．to operate; thatD．operated; what
B
本题考查非谓语动词及定语从句。名词factors与operate的关系为主动关系，用现在分词，后一空为定语从句，先行词为factors，在定语从句中作主语，故选B。
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