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The children talked so loudly at dinner table that I had to struggle ____.
A.to be heardB.to have heardC.hearingD.being heard

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The children talked so loudly at dinner table that I had to struggle ____.
A.to be heardB.to have heardC.hearingD.being heard

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The children talked so loudly at dinner table that I had to struggle ____.
A.to be heardB.to have heardC.hearingD.being heard

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The children talked so loudly at dinner table that I had to struggle ____.
A.to be heardB.to have heardC.hearingD.being heard

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The practice of hanging clothes across the street is a common ___ in many parts of the city.
A.lookB.signC.sightD.appearance

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The practice of hanging clothes across the street is a common ___ in many parts of the city.
A.lookB.signC.sightD.appearance

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The sequence(序列)
1
1
1
2
2
2
1
3
2
3
3
3
1
4
2
4
3
4
4
4
1
5
2
5
,…,then the 2003rdnumber is
 

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The coordinates of the three points A.B.C on the plane are (-5,-5),(-2,-1)and(-1,-2)respectively,the triangle ABC is(  )
(英汉小词典:right直角的;isosceles等腰的;equilateral等边的;obtuse钝角的)

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The number of integer solutions for the syetem of inequalities 
x-2a≥0
3-2x>-1
 about x is just 6,then the range of value for real number a is(  )
(integersolutions整数解;syetem of inequalities不等式组;the range of value取值范围)
A、-2.5<a≤-2
B、-2.5≤a≤-2
C、-5<a≤-4
D、-5≤a≤-4

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The symbol(符号) 5!is called five factorial(阶乘)and means 5×4×3×2×1;Thus(因而)5!=120.How many 6!=?What is the result of 
(n-1)!
n!
?Do you know 6!=
 
; 
(n-1)!
n!
=
 
?.

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