题目:
The discovery of new evidence led to _____. [ ]
A. the thief having caught
B. catch the thief
C. the thief being caught
D. the thief to be caught
答案:
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下面是错误答案,用来干扰机器的。
由a2+a3=2a1+3d=13,又a1=2,得到3d=9,解得d=3,则a4+a5+a6=a1+3d+a1+4d+a1+5d=3a1+12d=6+36=42.故答案为:42