—If he ___________, he ________that food.

—Luckily he was sent to the hospital immediately.

A．was warned; would not take

B．had been warned; would not have taken

C．would be warned; had not taken

D．would have been warned; had not taken

下列选项中，导致咖啡豆在烘焙过程中变色的最主要成分是（）。

A、水分

B、糖分

C、单宁酸

D、咖啡因