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hirashin

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Hello, native English speakers,

(a) I'm not sure if mini skirts will be in fashion this summer.
(b) I'm not sure whether mini skirts will be in fashion this summer.
(c) I'm not sure that mini skirts will be in fashion this summer.

I think (a) and (b) would be all right, but how about (c)?
Would (c) also sound right?

Hirashin
 

hirashin

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Addition:
(d) I'm not sure mini skirts will be in fashion this summer.

Thanks in advance.

Hirashin
 
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