At the age of 14, he went to his uncle's farm, where he had lessons on botany ___ .（ ）
A.self-taught
B.self-teaching
C.being self-taught
D.having self-taught
正确答案是B
At the age of 14, he went to his uncle's farm, where he had lessons on botany ___ .（ ）
A.self-taught
B.self-teaching
C.being self-taught
D.having self-taught
正确答案是B