Only by _______ your attention _______ w
题型:选择题
问题:
Only by _______ your attention _______ what you are learning can you learn it well.
A.concentrate; on
B.pay; on
C.concentrating; on
D.paying; on
Only by _______ your attention _______ what you are learning can you learn it well.
A.concentrate; on
B.pay; on
C.concentrating; on
D.paying; on