Mr Smith __________ at this school since he ________ Xiamen .A.has been teach,came B.has been teaching,came C.taught,came D.has been teaching,has come

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Mr Smith __________ at this school since he ________ Xiamen .A.has been teach,came B.has been teaching,came C.taught,came D.has been teaching,has come
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Mr Smith __________ at this school since he ________ Xiamen .A.has been teach,came B.has been teaching,came C.taught,came D.has been teaching,has come
Mr Smith __________ at this school since he ________ Xiamen .
A.has been teach,came B.has been teaching,came
C.taught,came D.has been teaching,has come

Mr Smith __________ at this school since he ________ Xiamen .A.has been teach,came B.has been teaching,came C.taught,came D.has been teaching,has come
选B.1空:现在完成进行时;2空:一般过去时.

c

b

B