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问题: 请教一道英语选择题,谢谢!

The old people ________ lonely at all since we bagan to wisit them once a week .
A. don't feel B . has’t felt C.have”t left D.didn”t feel

解答:

C
因为有since的句子中一般用完成时,后面的them提此时的people是负数,not at all 一点也不
意思是自从我们开始每周一次拜访那些老人,他们一点也不在感到孤独