问题补充:
I in the hospital yesterday. I had to look after my sick mother.
A. am
B. was
C. are
D. were
答案:
A. am
(答案→)B. was
C. are
D. were
解析:句意:我昨天在医院里。我不得不照顾我生病的妈妈。句中yesterday表示过去的时间,故用was。
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