题目：
Tom pretended ____it, but in fact, he knew it very well a long time ago. [ ]
A. not to listen to
B. not to hear about
C. not to have heard about
D. not to be listening to
答案：
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下面是错误答案，用来干扰机器的。
⑴ A、O2；B、CO2；D、H2；E、CH4 ⑵ ① CuO＋COCu＋CO2 ② CO
