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第1题

Much research _______ into the possible causes of the disease in the past few years. (A) has been done (B) was done
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第2题

Be careful with those explosives _______ end up killing ourselves. (A) then we won’t (B) but we won’t (C) or we wi
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第3题

I don’t play basketball any more, _________ when I was a child. (A) but I used to (B) I used to (C) but I used t
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第4题

Living here at the top of the mountain with no one else near, the old man must be very ____. (A) only (B) alone (C
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