All the students were sleeping____they heard a mAll the students were sleeping____they heard a man_________"help".A.when;shouting B.while;to shout C.was;to shout D.while;shouted

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Allthestudentsweresleeping____theyheardamAllthestudentsweresleeping____theyheardaman_________"help".

All the students were sleeping____they heard a mAll the students were sleeping____they heard a man_________"help".A.when;shouting B.while;to shout C.was;to shout D.while;shouted
All the students were sleeping____they heard a m
All the students were sleeping____they heard a man_________"help".
A.when;shouting B.while;to shout C.was;to shout D.while;shouted

All the students were sleeping____they heard a mAll the students were sleeping____they heard a man_________"help".A.when;shouting B.while;to shout C.was;to shout D.while;shouted
答案:
A
when表示同时性,hear sb doing

选A。
全体学生当他们听见一个男人大声呼救时都在睡觉。