题目列表(包括答案和解析)
_________ out of work for a few months, Mum took up the job of waiting on patients in hospitals.
[ ]
________ out of work for a few months, mother took up the job of waiting on patients in hospitals.
To be
Being
Having been
Having
________ out of work for a few months, Mum took up the job of waiting on patients in hospital.
A.Being
B.To be
C.Having been
D.Having
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