問題詳情:
We must do everything we can _______ waste water from running into rivers.
A、keep B、kept C、to keep D、keeping
【回答】
C
知識點:動詞和動詞短語
題型:選擇題
問題詳情:
We must do everything we can _______ waste water from running into rivers.
A、keep B、kept C、to keep D、keeping
【回答】
C
知識點:動詞和動詞短語
題型:選擇題