中文谷單項選擇He_____whentheUFOarrived. A.wassleeping B.were...
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問題詳情：
單項選擇
He _____ when the UFO arrived.
A. was sleeping B. were sleeping C. has slept D. is asleep
【回答】
A
知識點：動詞時態
題型：選擇題
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