Question

she studied hard failed.(and,but,so)​

Answer 1

She studied hard but failed.

Explanation:

• The correct blank that must be used is "but", as it explains the situation appropriately.

• If we will add "and" this will just lose the expression of the sentence.

• The reader will think about why did she fail, because usually if someone studies hard they do not fail.

• And if we will add "so" in the sentence it won't make sense at all, since if we study hard we pass so we cannot write it as:

• She studied hard so she failed. This does not make any sense.