____ will make your grandma happy if you buy a walking stick for her birthdaya.that b.itc.thisd.what

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____ will make your grandma happy if you buy a walking stick for her birthdaya.that b.itc.thisd.what
____ will make your grandma happy if you buy a walking stick for her birthday
a.that
b.it
c.this
d.what

____ will make your grandma happy if you buy a walking stick for her birthdaya.that b.itc.thisd.what
b.
it 指代后面买礼物的事.

B
it 是形式主语,指代的是if you buy a walking stick for her birthday

b