问题补充：
34．Hardlythe phoneI was told that the hotel had been booked full．
A. I had picked up；when
B. had I picked up；then
C. had I picked up；when
D. I had picked up；then
答案：
A. I had picked up；when
B. had I picked up；then
(答案→)C. had I picked up；when
D. I had picked up；then
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