laughter是可数还是不可数?我在有道上面查里面的词组里写着burstintolaughter.权威例句有Itriedtonegotiatealaughtracksothatifthejokesdon'tworkwecansuperimposesomelaughter.写着是somelaughter而原声

　　laughter是可数还是不可数?

　　我在有道上面查里面的词组里写着burstintolaughter.

　　权威例句有Itriedtonegotiatealaughtracksothatifthejokesdon'tworkwecansuperimposesomelaughter.写着是somelaughter

　　而原声例句里有Sosmilesandlaughtersarecontagious.

　　那到底laughter是可数还是不可数呢?

　　Onhearingthejoke,thestudentsburstinto________.

　　A.loudlaughtersB.aloudlaughter

　　C.loudlaughterD.loudlaughings

　　这道题又是选哪一项呢?