(A) According to the $VSEPR$ theory,for an $AB_{3}$ molecule to have a $T$-shaped geometry,the central atom $A$ must have $3$ bond pairs and $2$ lone

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(A) According to the $VSEPR$ theory,for an $AB_{3}$ molecule to have a $T$-shaped geometry,the central atom $A$ must have $3$ bond pairs and $2$ lone pairs of electrons.This corresponds to a steric number of $5$,which implies $sp^{3}d$ hybridization.As shown in the structure,there are $2$ lone pairs on the central atom $A$.