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【单选题】
加上-2a-7等于3a 2 +a的多项式是 [ ]A.
3a 2 +3a-7
B.
3a 2 +3a+7
C.
3a 2 -a-7
D.
-4a 2 -3a-7
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A.
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【简答题】从括号中选择词语将下文补充完整 One summer evening, shortly after I arrived at my new assignment, my boss walked by my house and saw my wife and children sitting on our front porch. He asked her where I was. My wife ...
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