单项选择题

______ a reply, he decided to write again.

A．Not receiving
B．Receiving not
C．Not having received
D．Having not received
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单项选择题
He said he______ me a present unless I ______in doing the experiment.
A．had not given; had not succeeded
B．would not give; succeed
C．will not give; succeed
D．would not give; will succeed
单项选择题
The missing boy was last seen ______near the river.
A．playing
B．to be playing
C．play
D．to play
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