单项选择题

The first textbook ______ for teaching English as a foreign language came out in the 16th century.

A.have written
B.to be written
C.being written
D.written
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单项选择题
—I can make it to your concert around 9 o’clock tomorrow night. —Well, by the time you arrive, I ______ my preference.
A.have finished
B.had finished
C.will be finished
D.will have finished
单项选择题
Can you imagine the difficulty I had ______ language obstacles I first studied abroad
A.to overcome
B.overcoming
C.overcome
D.overcame
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