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【单选题】

I will wait here ____ the concert is over.

A.
by
B.
when
C.
until
D.
as
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【简答题】已知定点F1（-3，0），F2（3，0），动点R在曲线C上运动且保持|RF1|+|RF2|的值不变，曲线C过点T（0，1），（Ⅰ）求曲线C的方程；（Ⅱ）M是曲线C上一点，过点M作斜率分别为k1和k2的直线MA，MB交曲线C于A、B两点，若A、B关于原点对称，求k1?k2的值；（Ⅲ）直线l过点F2，且与曲线C交于PQ，有如下命题p：“当直线l垂直于x轴时，△F1PQ的面积取得最大值”．判断命题p的真...
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A.
in
B.
at
C.
of
D.
on
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【单选题】—All of us can't know the word.— _____ look it up in the dictionary? [ ]
A.
Why
B.
Why not
C.
What about
D.
Why don't
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【单选题】Pleasegive ____________ yourpen. ____________ penisn'there.[ ]
A.
I;My
B.
mine;I
C.
me;Mine
D.
me;My
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【单选题】The house they live in was built hundreds of years ago. [ ]
A.
who
B.
when
C.
where
D.
which
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