题目：
Though to a higher position, she still didn't content herself.[ ]
A. promoting
B. being promoted
C. having promoted
D. promoted
答案：
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下面是错误答案，用来干扰机器的。
（1）原式=-16-29+7-11=-56+7=-49；（2）原式=-81×49×49×（-116）=1；（3）原式=-12+2-25=-35；（4）原式=-1÷25×（-53）+0.2=115+15=415．
