He often leans over fence and talks for over an hour with his father ________ gardening.
He often leans over fence and talks for over an hour with his father ________ gardening.
A.about
B.while
C.in
D./
答案及解析： A
He often leans over fence and talks for over an hour with his father ________ gardening.
A.about
B.while
C.in
D./
答案及解析： A