您好！

I

used

to

be

afraid

_A___big

dogs,now

I'm

still

afraid

___

big

dogs.

A

of;

to

see

B

to

;

of

seeing

C

of

seeing

;

to

D

to

;

of

be

afraid

to和be

afraid

of

意思都差不多，但是他们的用法还是有区别的：

to

后面加

动词原形

of

后面加

动名词形式也是V.-ing