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The teacher said that light____ much faster than sound.

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The teacher said that light____ much faster than sound.
A.travelled B.travels C.will travel D.is travelling
B
客观真理用一般现在时(尽管放在宾语从句中)
再问: How long ______ John _________(be)ill? He _________(be)ill since September.这道怎么做
再答: will... meet
再问: will…… meet 你开玩笑?
再答: How long ( has ) John ( been ) ill? He ( has been ) ill since September