问题
选择题
After ____ seemed to be a long time,the old man went out of the professor's sitting room. [ ]
A. it
B that
C. which
D. what
答案
答案：D
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After ____ seemed to be a long time,the old man went out of the professor's sitting room. [ ]
A. it
B that
C. which
D. what
答案：D