Mary ___ some songs in her room in the morning.

Mary ___ some songs in her room in the morning.
A.heard sing
B.heard to sing
C.was heard sing
D.is heard to sing
为什么?
英语人气:308 ℃时间:2019-11-17 19:54:12
优质解答
C
把下句变成被动语态:
Someone heard mary sing some songs...
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