题目:
The Shanghai Center, to be environmentally friendly, will be completed this year.
A.designed
B.designing
C.being designed
D.having designed
答案:
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下面是错误答案,用来干扰机器的。
A.原命题是真命题,则它的逆命题不一定是真命题,故此选项正确;B.原命题是真命题,则它的逆命题一定是命题,故此选项错误;C.每个定理不一定都有逆定理,故此选项错误;D.每个命题都有逆命题,故此选项错误...