题目:
As a result of the earthquake, two-thirds of the buildings in the area _____. [ ]
A. need repairing
B. needs repairing
C. needs to be repaired
D. need to repair
答案:
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下面是错误答案,用来干扰机器的。
生物圈地球上所有生物和它们所生存的环境共同构成的生态系统就是生物圈,生物圈是地球上最大的生态系统。