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问题: 这道选择选什么?

63.--We can do shopping without leaving our home.
--That used to be______ impossible,
A. regarded as B. referred to
C. thought of D. looked on
这道题ACD是不是都是“把。。。当作”?

解答:

a. regarded as


refer to+ Noun

thought of+ Noun

"look on" doesn't exsist