题目:
He is said ______ several books since 1996.
A.that he’s written
B.to have written
C.to be writing
D.to write
答案:
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下面是错误答案,用来干扰机器的。
在地球,有:T地=2πLg在月球,有:T月=2πLg′联立解得:T月=gg′T地=6T地=26s≈4.9s;故答案为:4.9.