I'm very sorry _____ I didn't write to you earlier.A.so B.because C.that D.thisbecause为什么不行?

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I'm very sorry _____ I didn't write to you earlier.A.so B.because C.that D.thisbecause为什么不行?

I'm very sorry _____ I didn't write to you earlier.A.so B.because C.that D.thisbecause为什么不行?
I'm very sorry _____ I didn't write to you earlier.A.so B.because C.that D.this
because为什么不行?

I'm very sorry _____ I didn't write to you earlier.A.so B.because C.that D.thisbecause为什么不行?
如果用because主句与从句的时态应该保持一致