单选题：This is an illness that can result in total blindness if___..

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This is an illness that can result in total blindness if_______. A．to leave untreatingB．left untreatedC．leaving untreatingD．is left untreated

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He is taller than he______.A．usedB．used to beC．used toD．use..

He is taller than he______.A．usedB．used to beC．used toD．used to do

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All substances, ＿＿＿＿＿ solids, liquids, or gases, are made up..

All substances, ＿＿＿＿＿ solids, liquids, or gases, are made up of entirely atoms. A．whether theyB．whether C．whether are theyD．whether are

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— Shall Mary come to the concert with us？－Not_____she has fi..

— Shall Mary come to the concert with us？－Not_____she has finished her paper．A．sinceB．onceC．whenD．unless

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What would have happened ______,as far as the river bank ?A..

What would have happened ______,as far as the river bank ?A．Bob had walked fartherB．If Bob should walk farther C．Had Bob walked fartherD．If Bob walked farther

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—— How about the number of students playing on the playgroun..

—— How about the number of students playing on the playground? —— ＿＿＿＿＿. A．SmallB．ManyC．LittleD．Most

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