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a man can find ; as a man has found; like will a man find; like can a man find; as
to be carried out being carried out carried out having been carried out
to get having got getting having been got
At no time In no time At any time At one time
will teach taught are being taught are teaching
is he isn’t he doesn’t he does he
have gone have been going was going will have gone
狐吃了一只兔，狐就可获得兔的全部能量 影响高山植物垂直分布的主要非生物因素是阳光 当草食动物从天然草场移离后，植物竞争的强度会降低 新疆哈密瓜大又甜，昼夜温差是影响其糖分含量的因素之一
布雷顿森林体系形成 世界贸易总额持续增长 各国关税壁垒森严 经济全球化的趋势
Ever since Now that Even though As long as
the; a the; the a; the a; a
Don’t say so. Come on! What a pity! Cheer up.
heavy smooth flexible fragile
looked up turned in searched for went through
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