【It】is a good idea【changing】the water every week.
每周换水是一个好主意
it 作形式主语,changing the water做真正的主语 .
如有疑问,请追问.
无疑后请采纳.
书山有路勤为径,学海无涯苦作舟.
-----------与君共勉-----------
_____is a good idea____the water every week.
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