( ) your sister happy?A.Is B.Do C.Does

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( ) your sister happy?A.Is B.Do C.Does
( ) your sister happy?A.Is B.Do C.Does

( ) your sister happy?A.Is B.Do C.Does
选A .happy是形容词,“be动词+形容词”构成谓表结构.

your sister 第三人称单数,句中缺少动词,所以用is

a 句中缺少谓语,需要is充当谓语的

A