50.

Answer and Explanation

Your Answer is

Correct Answer is F

Explanation

and parallel two sentences format: sentence 1, and sentence 2. Because ", and" is a complete sentence before, it should also be a complete sentence after judging and, and G has only the predicate of the attributive clause and no predicate of the main clause. The if clause cannot be used alone, and item H is wrong. Item J is meaningless.