单选题 The medical team ______ a breakthrough in their research on the treatment of cancer.

【正确答案】 C
【答案解析】breakthrough表示“重大发现”,经常与动词make一起适用。除此之外,请熟记make a mistake(犯错误),make a decision(做决定),make acommitment(做出承诺),make an impression(留下印象)等短语。