He ______when the UFO arrived. He didn’t wake until the UFO disappeared.
A．sleptB．was sleepingC．was doing homeworkD．was singing
B
考查點(diǎn)：賓語(yǔ)從句的時(shí)態(tài)。解題思路：如果從句講述的客觀事實(shí)或真理時(shí)，從句時(shí)態(tài)不受主句時(shí)態(tài)的限制，要用一般現(xiàn)在時(shí)。句意：他說“光比聲傳播的速度快”。故選C。
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