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
本題考查非謂語動詞及定語從句。名詞factors與operate的關(guān)系為主動關(guān)系，用現(xiàn)在分詞，后一空為定語從句，先行詞為factors，在定語從句中作主語，故選B。
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