房客入住时抱怨说，在他们到达之前，房间根本没打扫过。
The guests complained that the room had not been cleaned before they arrived.
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had英 /hæd/|美 /hæd/
not英 /nɒt/|美 /nɑt/
been英 /biːn/|美 /bɪn/
cleaned英 /kliːnd/|美 /klind/
解释
had not been cleaned 是过去完成时被动否定。had 为过去完成时助动词，not 构成否定，been cleaned 是被动语态。
The guests complained that the room had not been cleaned before they arrived.
had not been cleaned 是过去完成时被动否定。had 为过去完成时助动词，not 构成否定，been cleaned 是被动语态。