He has been here _____ ten years ago. [ ]A. since B. in C. for

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He has been here _____ ten years ago. [ ]
A. since
B. in
C. for

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举一反三

I feel a little tired, _____, I can hold on.    [     ]
A. however
B. and
C. but
D. so

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My teacher asked me _____ I was going to sing at the party and I said"Yes".[     ]
A. how
B. when
C. why
D. whether

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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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-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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