I was about to get on the bus ____someone called me from behind.
A．untilB．whetherC．whileD．when
D
考查連詞。此題是一個(gè)固定句型：be about to do … when ,即將做某事，正在那時(shí)，句意：我剛要上車正在這時(shí)有人在后面叫我。故選D。
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