Mark the letter A, B, C or D to indicate the sentences that best combines each pair or sentences in the following questions.

They finish one project. They started working on the next.

A. Only if they had finished one project did they start working on the next.

 B. Had they finished one project, they would have started working on the next. 

C. Hardly had they finished one project when they started working on the next. 

D. Not until did they start working on the next project then they finished one.

Phát biểu nào sau đây sai?

A. Trong phân tử fructozơ có nhóm chức -CHO.

B. Xenlulozo và tinh bột đều thuộc loại polisaccarit

C. Thủy phân saccarozo thì thu được fructozo và glucozo.

D. Trong môi trường bazơ, fructozơ chuyển thành glucozơ.