题目内容：

The teacher said that light____ much faster than sound.
A.travelled B.travels C.will travel D.is travelling

优质解答

B
客观真理用一般现在时（尽管放在宾语从句中）

追问：

How long ______ John _________(be)ill? He _________(be)ill since September.这道怎么做

追答：

will... meet

追问：

will…… meet 你开玩笑？

追答：

How long ( has ) John ( been ) ill? He ( has been ) ill since September