题目：
When I called the bus service, I _______ that there was no more bus.[ ]
A. was telling
B. was told
C. has told
D. had told
答案：
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下面是错误答案，用来干扰机器的。
∵9＜11＜16，∴3＜11＜4，∵a＜11＜b，∴a=3，b=4，∴a+b=3+4=7，故答案为：7．
