Some one was opening the front door with a latchkey.
有人正用钥匙打开房子的前门。
When I was opening the front door, the telephone rang.
我正开前门时，电话铃响了。
Just as I was opening the front door, the telephone rang.
我正开前门的时候，电话铃响了。
Someone was opening the front door with a latchkey.
有人在用门锁钥匙开前门。
Someone was opening the front door with a latchkey.
有人在用门锁钥匙开前门。
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