My relatives came to visit us ___a warm spring morning.A.in B.on C.with D.at

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My relatives came to visit us ___a warm spring morning.A.in B.on C.with D.at

My relatives came to visit us ___a warm spring morning.A.in B.on C.with D.at
My relatives came to visit us ___a warm spring morning.A.in B.on C.with D.at

My relatives came to visit us ___a warm spring morning.A.in B.on C.with D.at
选B,如果不加形容词是 in,但是已经修饰了,就是B,

A 因为在具体的日期时间前加on但是一个暖春的早上好像不怎么具体。不知道年月日。所以用in
可以解释为在什么气氛中。