选A.
since后面接过去的某一时间点.
for a week表示一段时间.for与since是不可能连用的.
a week before只用于过去完成时,不能用在since后面.只有改成a week ago才可以用在since的后面.
the last week是错误的表达方式,last已经含有特指的意思,也就是说已经包含了the的意思.前面如果再加the就重复了.
I have been like this ever since____.选项：A.last week B.for a
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