they are twins, they don"t look the same at all.[ ]A. Because

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         they are twins, they don"t look the same at all.[     ]
A. Because
B. Though
C. As
D. Since

答案

举一反三

My sister       _ go to bed        my mother came back last night.         [     ]
A. not, until
B. doesn"t; until
C. didn"t; until
D. aren"t, until

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Mary often eats junk food,            she knows it"s bad for her health.[     ]
A. although
B. so
C. and
D. or

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My sister and I look different _____ we are twins. [ ]
A. as
B. though
C. because
D. and

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Mary doesn"t like snakes _____ they are ugly.[ ]
A. because
B. and
C. but
D. so

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it is dark now, the workers go on working there. [ ]
A. Though
B. Because
C. As
D. When

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