Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to the following question.
The mountains surrounding Los Angeles effectively shield the city from the hot, dry winds of the Mojave Desert, _____ the circulation of air.
A.but they also prevent
B.also prevented by them
C.and also to prevent
D.and also preventing
The mountains surrounding Los Angeles effectively shield the city from the hot, dry winds of the Mojave Desert, _____ the circulation of air.
A.but they also prevent
B.also prevented by them
C.and also to prevent
D.and also preventing
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