He often ________ until it is dark.
He often ________ until it is dark.
A.goes on to work
B.goes on working
C.goes on with working
D.goes with work
答案及解析： B
He often ________ until it is dark.
A.goes on to work
B.goes on working
C.goes on with working
D.goes with work
答案及解析： B