She has been skating _______she came to our city. [ ]A. for B. w

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She has been skating _______she came to our city.   [     ]
A. for
B. when
C. since
D. before

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举一反三

-Did you catch what the teacher said?
-No. She spoke so fast _____ I couldn"t hear her very clearly.[ ]
A. which
B. that
C. when
D. since

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_____ he is only 8 years old, he knows more than science than his father.[ ]
A. But
B. Though
C. So
D. Because

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some students are lack of the first class _______ they take their vacations.[     ]
A. because of
B. as
C. before
D. and

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

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-Shall we go on working?
-Yes, _____ I prefer to have a rest.[ ]
A. when
B. if
C. though
D. because

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