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：賓語從句的時態(tài)。解題思路：如果從句講述的客觀事實或真理時，從句時態(tài)不受主句時態(tài)的限制，要用一般現(xiàn)在時。句意：他說“光比聲傳播的速度快”。故選C。
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