– Why you didn’t handed in your exercise paper?
–Sorry, but I ____ that it should be turned in today.
A.didn’t know | B.hadn’t known |
C.haven’t known | D.don’t know |
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– Why you didn’t handed in your exercise paper?
–Sorry, but I ____ that it should be turned in today.
A.didn’t know | B.hadn’t known |
C.haven’t known | D.don’t know |