Is the following sentence a complete sentence or a fragment? if it is a complete sentence choose correct; if it is a fragment, choose the correct response that will make it a complete sentence.
As the sky darkened to an eerie shade of gray and the tornado swept through the little town.
Select one:
a. As the sky darkened to an eerie shade of gray and as the tornado swept through the little town.
Ob. As the sky darkened to an eerie shade of gray and the tornado swept through the little town, the children ran for cover.
c. The sentence is correct.
d. As the sky darkened to an eerie shade of gray. The tornado swept through the litle town.

The original sentence WAS a fragment; now this corrected version is a complete (complex) sentence.

As the sky darkened to an eerie shade of gray and the tornado swept through the little town, the children ran for cover.

Explanation:

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.

no it who u choose to be. let no one tel u what or who to be;