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
The teacher, as well as the students ______ having a picnic. A) are C) be B) is D) being
The teacher, as well as the students ______ having a picnic.
A) are C) be
B) is D) being
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,
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