THE CORRECT ANSWER IS (C). IN THE ORIGINAL SENTENCE, THE TWO-WORD...
12. The correct answer is (C). In the original sentence, the two-word phrase some times
is improper in context and should be replaced with a word such as occasionally or
sometimes. Also, the original sentence employs the passive voice—the subject (airplanes
departing) is acted upon by (prevented by) its object (severe weather). The result is
awkward and confusing. Choice (C) corrects both problems, replacing some times with
sometimes and using the active voice instead.