GMAT Sentence Correction (SC) | Along with the drop in producer prices announced yesterday,

GMAT has put in the un-underlined part and hence has made its intention clear that although need not be followed by a clause. The matter should rest there, but still, the following tips might be handy.

1.If although starts a sentence, then although part can be either a verbed clause or a verb - less modifier.

Examples:
A. Although I didn't do well in my GMAT, I got 700 -- A verbed clause started by the conjunction although.
B.
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