hmboy17 wrote:Varieties of influenza range in severity from mild flus, treatable with bed rest and lasting only a few days, to acute forms, such as bacterial pneumonia, that are potentially fatal.


mild flus, treatable with bed rest and lasting only a few days, to ---lasting properly modifies "mild flus" look at it this way ....Varieties of influenza range in severity from mild flus,lasting only a few days, to acute forms

mild flus, treatable with bed rest and last only a few days, to --now when you put last instead of last , you will notice it is awkward.

mild flus, treatable with bed rest, and they last only a few days, to

those mild flus, able to be treated with bed rest and in duration only a few days, to those

those mild flus which are treatable with bed rest and which last only a few days to those

OA is A why not [spoiler]b
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