Question

The students asked _________________

1. A.
   when can they surf the Internet in class
2. B.
   when could they surf the Internet in class
3. C.
   when they could surf the Internet in class
4. D.
   when they can surf the Internet in class

Answer 1

C
考查時(shí)態(tài)和賓語(yǔ)從句的語(yǔ)序。所有的名詞性從句都使用陳述語(yǔ)序，排除AB；asked是過(guò)去時(shí)，后面的賓語(yǔ)從句也應(yīng)該使用過(guò)去時(shí)。