HSK 7-9
莫非
mòfēi副
can it be possible that; could it be
门还锁着，莫非他没回来？
Mén hái suǒ zhe, mòfēi tā méi huílái?
The door is still locked—could it be that he has not returned?
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Appears across levels (7-9) in the HSK 3.0 word list.