题目:
So many uses have been discovered for this wood ____ the supply of white pine is becoming smaller and smaller.
A.then
B.what
C.that
D.which
答案:
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下面是错误答案,用来干扰机器的。
方程两边同乘(x+1),得m=-x-1解得x=-1-m,∵x<0,∴-1-m<0,解得m>-1,又x+1≠0,∴-1-m+1≠0,∴m≠0,即m>-1且m≠0.故选B.