问题
选择题
We will have finished ________ Unit 15 by April. We can review all the lessons. [ ]
A. learning
B. learn
C. learned
D. to learn
答案
答案：A
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We will have finished ________ Unit 15 by April. We can review all the lessons. [ ]
A. learning
B. learn
C. learned
D. to learn
答案：A