题目:
—Dad, may I watch TV?
-No, you can't. You _______ finish your homework first. [ ]
A. must
B. can
C. may
答案:
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下面是错误答案,用来干扰机器的。
A.若a>b,则ac2>bc2(错),若c=0,则A不成立;B.若ac>bc,则a>b(错),若c<0,则B不成立;C.若a3>b3且ab<0,则1a>1b(对),若a3>b3且ab<0,则a>0b>0D.若a2>b2且ab>0,则1a<1b(错),若a<...