单项选择题

______ in thought, he almost ran into the tree in front of him,
A) Lost C) To lose
B) Losing D) Have lost
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单项选择题
Not until I graduated from the college ______ how much time I had wasted. A) have I realized C) I have realized B) did I realize D) that I realized,
Not until I graduated from the college ______ how much time I had wasted.
A) have I realized C) I have realized
B) did I realize D) that I realized,
单项选择题
______ England improve their game, they're going to lose the match. A) Unless C) If B) As D) As long as
______ England improve their game, they're going to lose the match.
A) Unless C) If
B) As D) As long as
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