The first textbooks _____ for teaching English as a foreign language came out in the 16th century. 
#98254
A
being heard
B
to be written
C
being written
D
written
推荐题目
Robert is said _______ abroad, but I don’t know what country he studied in. 
#98633
A
to have studied
B
to study
C
to be studying
D
to have been studying
His father disappeared, ________ two children and never _______ from again.
#97926
A
left; being heard
B
leaving; heard
C
left; be heard
D
leaving; to be heard