If we put all the rubbish into the dustbin, we can keep our classroom clean.(句意不变)We can keep our classroom clean ______ ______ all the rubbish into the dustbin.

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If we put all the rubbish into the dustbin, we can keep our classroom clean.(句意不变)We can keep our classroom clean ______ ______ all the rubbish into the dustbin.

If we put all the rubbish into the dustbin, we can keep our classroom clean.(句意不变)We can keep our classroom clean ______ ______ all the rubbish into the dustbin.
If we put all the rubbish into the dustbin, we can keep our classroom clean.(句意不变)
We can keep our classroom clean ______ ______ all the rubbish into the dustbin.

If we put all the rubbish into the dustbin, we can keep our classroom clean.(句意不变)We can keep our classroom clean ______ ______ all the rubbish into the dustbin.
if put

if letting.
如果把所有垃圾放进垃圾桶