单选题 Doing your homework is a sure way to improve your test scores, and this is especially true ______it comes to classroom tests.
A. after B. as C. when D. before

【正确答案】 C

【答案解析】[解析] when/if it comes to sth．当谈到；如果涉及。如：Joe is not good in sports，but when it comes to arithmetic he is the best in the class．If it comes to building，Austinsis the firm you should consult．