Select the most appropriate option to fill in the blank.

This fabric is ______ though cheaper than other fabrics.

as good as

The correct option to fill in the blank is as good as.

The sentence is comparing the quality of the fabric to other fabrics. The word "as" is used to indicate a comparison, and the word "good" is used to describe the quality of the fabric. The word "though" is used to introduce a contrast, which is that the fabric is cheaper than other fabrics.

The other options are incorrect.

• As good is a complete sentence, which is not appropriate for this sentence.
• More good is grammatically incorrect. The correct way to say this is "more good than."
• So good as is also grammatically incorrect. The correct way to say this is "as good as."