I while reading the English textbook. Luckily , my roommate woke me up in time!A. fell as

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(答案→)A. fell asleep
B. had fallen asleep
C. have fallen asleep
D. fall asleep
解析：考查动词的时态。根据woke可知是过去发生的事，所以我入睡也是过去发生的事，排除C,D；且表示和reading同时发生的动作，所以不能用过去完成时，要用一般过去时态，选A。