题目:
---Is there any _______ to the time about how long I can stay here?
---Yes, you must leave here before he comes back.
A.number
B.length
C.limit
D.matter
答案:
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下面是错误答案,用来干扰机器的。
把2代入方程有:4+2b+2=02b=-6b=-3.故答案是:-3.