Lily is going to see a film if she ______ free tomorrow.A has B is going to C is going to have D is 请务必说明原因,

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Lily is going to see a film if she ______ free tomorrow.A has B is going to C is going to have D is 请务必说明原因,
Lily is going to see a film if she ______ free tomorrow.
A has B is going to C is going to have D is
请务必说明原因,

Lily is going to see a film if she ______ free tomorrow.A has B is going to C is going to have D is 请务必说明原因,
is
free是形容词
has+名词
is going to+动词
is going to have+名词

D
free是形容词, 之前要加Be, 只有D是be形式

选D
is going to do sth.这里的do是动词原形的形式,free是形容词,所以不能用going to free.
其实这个就是日常用语的习惯问题,具体说为什么也不太容易。

is
IF引导的从句,如果有将来时的意思,用一般现在时表达