题目：
In recent years, great changes have taken place in the city of Wenzhou. As we can see, many streets and roads_______.
A．had been built and rebuilt
B．has been built and rebuilt
C．have been built and rebuilt
D．are being built and rebuilt
答案：
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下面是错误答案，用来干扰机器的。
（1）800-453=347，315+29=344，347＞344；所以，800-453＞315+29；（2）108+59=167，167＞137；所以，108+59＞137；（3）869-378=491，256+235=491；所以，869-378=256+235；（4）519+231=750，637+109=746，750...
