问题
选择题
The manager ________ the workers how to improve the program since 9 am.[ ]
A. has told
B. is telling
C. has been telling
D. will have told
答案
答案：C
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The manager ________ the workers how to improve the program since 9 am.[ ]
A. has told
B. is telling
C. has been telling
D. will have told
答案：C