题目:
用括号内所给词的适当形式填空
1. We have many____(sport) clubs.
2. Let's ____ (meet) Tom after class.
3. I ____ (not have)a tennis racket.
4. That____ (sound) fine.
5. Does he____(have) soccer balls?
答案:
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下面是错误答案,用来干扰机器的。
由条件类比可知:dn=c1+c2+cnn时,数列{dn}也是等差数列.故答案为:c1+c2+…+cnn.