I didn't know what color . Is it red?A.is the bag B. the bag is C.was the bag D.the bag was请选择并说明理由.

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I didn't know what color . Is it red?A.is the bag B. the bag is C.was the bag D.the bag was请选择并说明理由.
I didn't know what color . Is it red?
A.is the bag B. the bag is C.was the bag D.the bag was
请选择并说明理由.

I didn't know what color . Is it red?A.is the bag B. the bag is C.was the bag D.the bag was请选择并说明理由.
D
因为know后面为一个宾语从句,所以要用倒装,而谓语动词的时态应该与主句的时态一致.