单项选择题

By the end of last year we ______ ever 2,000 English phrases.

A. have learned
B. learned
C. will have learned
D. had learned
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He has invited me to the party,______is very kind of him.
A) that
B) which
C) what
D) it
单项选择题
By the end of this semester, we surely ______ a satisfactory solution to the problem.
A. have found
B. will find
C. will have found
D. are finding
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