Question

Harvey finished typing his research paper, but he needed to proofread it before submitting it to the professor.

Choose the answer that is the most effective substitute for the underlined part of the sentence. If no substitute is necessary, choose ‘Leave as is.’ The underlined words are: but he needed.
A)
Leave as is.
B)
research paper but he needed
C)
research paper; but he needed
D)
research paper. But he needed

Answer 1

The answer to this is A. Leave as is. This is because when you read the sentence you stop at the comma after paper and then continue. It makes most sense if we leave it alone. It is the best choice. 

So, your answer is A. Leave as is.

Hope I helped ya!!!!!

Answer 2

Answer: A) Leave as is.

Explanation: "But" can join two independent clauses (clauses that make sense by themselves) or an independent clause with a dependent clause (a clause that doesn't make sense on its own). When "but" is joining two independent clauses, we need to put a comma before the "but." If it is joining a independent clause with a dependent clause, we don't have to put any punctuation before "but." In the given sentence we have two independent clauses "Harvey finished typing his research paper" and "he needed to proofread it before submitting it to the professor" so the correct answer is leave as is (with a comma).