Shehastakencareofyourchildrenyouareaway.aduringbsincecexceptdwhile您好!b.但我认为从句的are要改成were吧?选：d不行.或者改成：Shewill(can)takecareofyourchildrenwhileyouareaway.

Question

She has taken care of your children ___ you are away.
a during b since c except d while
您好!b .但我认为从句的are要改成were吧?
选：d 不行.或者改成：She will(can) take care of your children while you are away.

Answer 1

一、你说的很对,since 表示从过去的一个时间点开始一直到现在,因此它引导的从句中的谓语动词应该用过去时态,如：
He hasn't been home since he [graduated].他毕业后没回过家.
We have both changed since we [parted].分别以来我们彼此都变了.
二、while 表示在某个延续行为或状态的的同时,另外用在时间状语从句中的现在时态还表示将来,因此你说的 She will(can) take care of your children while you are away 也是对的.