问题
选择题
The secretary________letters all the afternoon and there are still two letters to finish. [ ]
A. is typing
B. had type
C. has been typed
D. has been typing
答案
答案：D
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The secretary________letters all the afternoon and there are still two letters to finish. [ ]
A. is typing
B. had type
C. has been typed
D. has been typing
答案：D