单项选择题

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

A. writing
B. written
C. to write
D. to be written
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单项选择题
______ that Bob had got promoted, his friends came to congratulate him.
A. Heard
B. Having heard
C. Hear
D. To hear
单项选择题
It was because of his good performance ______ he got the promotion.
A. so
B. that
C. what
D. while
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