问题

The first textbooks ______ forteaching English as a foreign language came out in the 16th century.

A:was doinghad taken
B:why
C:how
D:having written

正确答案是：

同类题型

It was for a lifetime of unselfish workamong the sick natives ______ the old doctor deserved to be honored

can’t finish the book in less thanan hour, I suppose—_______ I’ll return it to you on time

Detective Lu said the murder probably happened________ .

How foolish I was!— ________ you have realized that，stop blaming yourself．

Would you mind opening the window It’s too hot.–