——Where Was your brother at this time last night? ——He was writing an e - mail____I was watching TV at home.

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问题 ——Where Was your brother at this time last night? ——He was writing an e - mail____I was watching TV at home.

选项 A、as soon as
B、after
C、until
D、while

答案D

解析 由问句中的“at this time last night”可知,问的是具体的时间点,while在此作连词,意为“当……时”,表示两个动作同时发生。as soon as意为“一……就”;after意为“在…以后”;until意为“直到……为止,直到……才”。
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