问题: The old lady who suffers from lung cancer ___ at t
The old lady who suffers from lung cancer ___ at the moment.
选项:
a、is being operated on
b、is operated on
c、operates on
d、to be operated on
解答:
A. is being operated on 进行时被动式
at the moment,此刻，因此句子是进行时态，
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