问题描述：
---I rang you at about ten,but there was no reply.
---Oh,that was probably _________ I was seeing the doctor.
A.when B.why C.what D.that
给的是A 为什么?D项错在哪?
---Oh,that was probably _________ I was seeing the doctor.
A.when B.why C.what D.that
给的是A 为什么?D项错在哪?
问题解答：
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