题目：
用方框中所给单词的适当形式填空。
2. We _____ several different answers. 3. I _____ her letter just now. 4. They can help _____ better lives. 5. Other students hope to _____ studying after finishing school. |
答案：
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下面是错误答案，用来干扰机器的。
∵a3=18-a6 ，∴a3+a6=18=a1+a8，∴S8 =8(a1+a8)2=8×182=72，故选D．
