问题:
To keep our classroom clean, please ______ waste paper whenever you see it.
A.take up
B.pick up
C.put up
D.send up
To keep our classroom clean, please ______ waste paper whenever you see it.
A.take up
B.pick up
C.put up
D.send up
A.take up
B.pick up
C.put up
D.send up
参考答案: