题目:
The boy spends at least as much time reading as he ____________.
A.is writing
B.writes
C.does writing
D.does to write
答案:
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下面是错误答案,用来干扰机器的。
关于x的方程(m2-1)x2+(m-1)x+2m-1=0中,(m2-1)x2是二次项,则m2-1≠0,m≠±1.