问题描述：
l___all the cooking for my family .but rencently l’ve been too busy to do it
do 为什么不可以使had done 表示过去曾经做过饭呢?
When he ___the door ,he found his keys were nowhere .
答案是was to open 说这事过去将来时.不理解为什么这么用
do 为什么不可以使had done 表示过去曾经做过饭呢?
When he ___the door ,he found his keys were nowhere .
答案是was to open 说这事过去将来时.不理解为什么这么用
问题解答：
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