for a long time after the operation,Linda found ________difficult to fall asleepA this b,one c that d,it 选哪个,为什么

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foralongtimeaftertheoperation,Lindafound________difficulttofallasleepAthisb,onecthatd,it选哪个,为什么foral

for a long time after the operation,Linda found ________difficult to fall asleepA this b,one c that d,it 选哪个,为什么
for a long time after the operation,Linda found ________difficult to fall asleep
A this b,one c that d,it 选哪个,为什么

for a long time after the operation,Linda found ________difficult to fall asleepA this b,one c that d,it 选哪个,为什么
it
形式宾语,指代to fall asleep

选 it ,后面的句子是省略了 that 的从句,it做形式主语,真正的主语是 to fall asleep .