it was not until she had arrived that

Question

It was not until she had arrived home _____ remembered her appointment with the doctor.
A.when she B.that she C.and she D.she
我知道这道题是强调句型,但觉得去掉 it was that 后感觉少点东西,

Answer 1

B.that she
用还原法：
She had (not )remembered her appointment with the doctor( until ) she had arrived home 她到家才想起想起和医生的约会.