Our English teacher _____ in our school since he _______ to China.A:has taught,come B:taught ,…come C:has taught,has come D:teaches,has…come

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OurEnglishteacher_____inourschoolsincehe_______toChina.A:hastaught,comeB:taught,…comeC:hastaught,has

Our English teacher _____ in our school since he _______ to China.A:has taught,come B:taught ,…come C:has taught,has come D:teaches,has…come
Our English teacher _____ in our school since he _______ to China.
A:has taught,come B:taught ,…come
C:has taught,has come D:teaches,has…come

Our English teacher _____ in our school since he _______ to China.A:has taught,come B:taught ,…come C:has taught,has come D:teaches,has…come
没答案啊,应该是has taught,came
意思是自从我们英语老师来到中国,一直在我们学校教书.
since表示自从的意思,引导时间状语从句.从过去某一点时间到现在,所以since从句中用一般过去时,主句用现在完成时