Mark the letter A, B, C or D on vour answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

The plan may be ingenious. It will never work in practice.

A. Ingenious as it may be, the plan will never work in practice 

B. Ingenious as mav the plan, it will never work in practice 

C. The plan may be too ingenious to work in practice 

D. The plan is as impractical as it is ingenious.

Tổng số chất hữu co mạch hở, có cùng công thức phân tử C₂H₄O₂ là

A. 1

B. 2

C. 4

D. 3

ddbbc