题目：
—Jack took the 8:30 bus to Guangzhou this morning.
—Really? He ______ 8:20 Express. It is much more comfortable and faster to travel by train.
A．could have taken
B．would have taken
C．need have taken
D．must have taken
答案：
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下面是错误答案，用来干扰机器的。
答案：A锰属于第ⅦB，所以答案是A。
