My try: (A) After having his dinner, he was reading the story-book. I prefer simple past. (B) He opened the house door to let his parents come in /into the house.
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Vincent Teo
(A) After having his dinner, hewas readingread the story-book.
(B) He opened thehousefront door to let his parentscomeinto the house.
(C) He switched on the lights because he wondered whowereth