-It took me nearly 5 years to make a breakthrough in my field.-- Well you know wha

问题补充：

---- It took me nearly 5 years to make a breakthrough in my field.

---- Well, you know what people say. .

A. There is no smoke without fire.

B. Practice makes perfect.

C. All roads lead to Rome.

D. No pains, no gains.

答案：

A. There is no smoke without fire.

B. Practice makes perfect.

C. All roads lead to Rome.

(答案→)D. No pains, no gains.

解析：考查谚语。There si no smoke without fire,无风不起浪。 Practice makes perfect.熟能生巧。 All roads lead to Rome.条条大路通罗马。 No pains,no gains. 没有付出就没有回报。

句意为---在这个领域取得突破花了我5年的时间。----没有付出就没有回报。