问题
The first textbooks ______ for teaching English as aforeign language came out in the 16th century.
A:having written
B:to be written
C:being written
D:written
B:to be written
C:being written
D:written
正确答案是：
同类题型
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Everyone’s attention was drawn to the eightyearold girl who was ________ perfectly at the piano. [ ]