单项选择题
A.must be
B.can be
C.would be
D.could be
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A.must have killed
B.would have killed
C.should have killed
D.could have killed
A.错误
B.正确
A.My pleasure.
B.It doesn’t matter.
C.No, thanks.
D.It’s Ok.
A.IEEE 802.15.1 Bluetooth 4.1
B.IEEE 802.11n WiFi
C.IEEE 802.15.4. Zigbee
D.IEEE 802.15.3
E.IEEE 802.11ah
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