Question

what wer you doing when John came in well, I() a bath and was starting to write a letter

a have just had b had just had c was just having d had选哪个请解释

Answer 1

用b. 问的是过去的事，问我那时在干什么。
回答是 当 John 进来时，我正开始要去写信。
空白处要填的 是开始写信 那个 时间点前 刚完成的 事情： 我刚洗完澡。
所以 填 had just had -- 过去完成时。