"The best time to plant . . . . . . . . tree was 20 years ago. . . . . . . . . second best time is now."

A. a B. an C. the D. none of the above

A. a B. an C. the D. none of the above

A. the, a, an, a B. a, the, the, the C. no article, a, an, the D. the, a, the, the

A. the, the B. a, the C. a, a D. none