摘要：9．Though they are twins.they do everything .
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_______ they are twin brothers, they don’t look like each other.
A. Though B. Since C. However D. When
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______ they are twin sisters, they don't look like each other.
[ ]
A. Because
B. Since
C. Though
D. However
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B. Since
C. Though
D. However
_______ they are twin brothers, they don't look like each other.
[ ]
A. Though
B. Since
C. However
D. When
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B. Since
C. However
D. When