题目内容

He ______when the UFO arrived. He didn’t wake until the UFO disappeared.
A．sleptB．was sleepingC．was doing homeworkD．was singing
B
考查点：宾语从句的时态。解题思路：如果从句讲述的客观事实或真理时，从句时态不受主句时态的限制，要用一般现在时。句意：他说“光比声传播的速度快”。故选C。
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