摘要：33． We must do everything we can waste water from running into rivers． A． keep B． kept C． to keep D． keeping
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We must do everything we can _________ waste water from running into rivers．
A． keep B． kept C． to keep D． keeping
查看习题详情和答案>>We must do everything we can ________ waste water from running into rivers．
- A.keep
- B.kept
- C.to keep
- D.keeping
We must do everything we can ________ waste water from running into rivers．
[ ]
A．
keep
B．
kept
C．
to keep
D．
keeping