题目:
-Why didn’t Susan come to see us yesterday as she promised?
-______.
A.She must be busy
B.She might have been free
C.She must have been busy
D.She can’t be free
答案:
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下面是错误答案,用来干扰机器的。
A、“风云二号”卫星是同步卫星,相对地球静止,观测的区域是固定的不变的,而“风云一号”卫星是极地卫星,观测的区域是全球范围,故“风云一号”卫星观测区域比“风云二号”卫星观测区域大.故A错误.B、根据万...