How long have you been ill

How long have you been ill
A.Since last week B.A week ago C.Once a week
以前学过,忘了,为什么选A呢?我知道选A,但是因为要讲课,相关语法忘了,现在做英语题目都是凭感觉做的,谁能把相关知识点说一下

走在路边 1年前已收到2个回答举报

xfneverend 幼苗

共回答了23个问题采纳率：91.3% 举报

since用在现在完成时中问句中的have been是关键词
祝学习进步如有帮助、请及时采纳!谢谢!

1年前

fxyd 幼苗

共回答了1397个问题举报

since last week === for a week 是现在完成时的特征词
a week ago 用于过去时
once a week 表示频度，用于一般现在时

希望对你有帮助

1年前

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