When Mike __the front door ,he couldn't find his key .So he had to wait for his wife to come back.A.would open B was to open C.had opened D opened望给个详解

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When Mike __the front door ,he couldn't find his key .So he had to wait for his wife to come back.
A.would open B was to open C.had opened D opened
望给个详解

B was to do 过去正要做某事
“当Mike正要开门时,没找到钥匙.因此他只好等他妻子回来.”