Margaret stopped singing _____ she heard somebody calling outside.
A、hurriedly
B、hastily
C、abruptly
D、unexpectedly
【正确答案】：C
【题目解析】：解析：本题考查副词词义辨析。A.hurriedly：匆忙地，急促地；B.hastily：急速地，慌忙地；C.abruptly：突然地，唐突地；D.unexpectedly：出乎意料地。根据题意，“玛格丽特听到外面有人叫她，马上停止了唱歌。”C最符合题意。答案为C。
