问题
选择题
Ben was busy taking a training class. ______we had to wait for himfor half an hour..
A．so
B．if
C．or
D．but
答案
答案：A
本题难度适中，前后句子是因果关系，答案选A。
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Ben was busy taking a training class. ______we had to wait for himfor half an hour..
A．so
B．if
C．or
D．but
答案：A
本题难度适中，前后句子是因果关系，答案选A。