单项选择题

My wife often forgets ______ the door, but she remembered ______ it when she left yesterday.

A．closing; close
B．closing; to close
C．to close; closing
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单项选择题
The girl was heard ______ upstairs.
A．to sing
B．sing
C．singing
单项选择题
John will not listen to you ______ you are right.
A．whether
B．since
C．unless
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