单选题：This is an illness that may result in total blindness if .A..

Next door to ours ________, who is no less than eighty. [ ]A. that lives an old manB. does an old man liveC. lives an old manD. where lives an old man

Away _____ and in ______.[ ]A. went he; came his sisterB. he went; his sister came C. went he; his sister cameD. he went; came his sister

________, he does get annoyed with her sometimes.A．Although much he like herB．Much although he likes herC．As he likes her muchD．Much as he likes her

They don't study in No 1 High School, ___ those boys.A．so doB．so don'tC．neither studyD．nor do

This river is seriously polluted now,but once inside it ______. [ ]A. there lived many fishesB. lived many fishes C. where lived many fishesD. that lived many fishes