_______a hot morning,he went to the pool with his uncle.a.on b.in c.at d.o____ a hot morning ,he wants to the pool with his uncle .A.on B.in C.at D.of

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_______a hot morning,he went to the pool with his uncle.a.on b.in c.at d.o____ a hot morning ,he wants to the pool with his uncle .A.on B.in C.at D.of

_______a hot morning,he went to the pool with his uncle.a.on b.in c.at d.o____ a hot morning ,he wants to the pool with his uncle .A.on B.in C.at D.of
_______a hot morning,he went to the pool with his uncle.a.on b.in c.at d.o
____ a hot morning ,he wants to the pool with his uncle .
A.on B.in C.at D.of

_______a hot morning,he went to the pool with his uncle.a.on b.in c.at d.o____ a hot morning ,he wants to the pool with his uncle .A.on B.in C.at D.of
A.
on 是指具体某一天

B,morning是一个时间,我们经常说in the morning,

A 在某一天on,某一天的早上同理

A 表示具体某天的某时段,用介词on。
或者这样记忆:一天中的时间段名词,如有除冠词以外的修饰语时,要用介词on。