The limousine driver has waited for almost an hour before deciding

KAPLAN OFFICIAL SOLUTION:

Correct Choice: (B)

The driver completed both actions, waiting and deciding, in the past, so choice (A)’s “has waited”—which implies that he’s still waiting — is wrong. The other problem here is that, while it’s acceptable in conversation to say the driver waited “before deciding his client wasn’t going to show up”, GMAT English requires a “that” to introduce the independent clause “his client was not going to show up”. Choice (B) corrects both of these mistakes.Choice (E) corrects the first mistake but not the second. Choice (C) corrects the second but not the first; moreover, (C) also errs by needlessly changing“deciding” to “he decided”. Choice (D) incorrectly uses the past participle form, “was waiting,” and neglects to put a “that” after “deciding”.