I know that he ______________ in the library at this moment. A. works B. has worked C. is working D. was working

Mark the letter A, B, C, or D to indicate the most suitable answer to each of the following questions.

I know that he ______________ in the library at this moment.

A. works           
B. has worked  
C. is working       
D. was working

Trả lời

Chọn đáp án C

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