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单项选择题
A．Her back was hurt during the meeting.B．She agreed that it was a good meeting.C．The proposal should be sent back.D．His support would have helped this morning.
A．Her back was hurt during the meeting.
B．She agreed that it was a good meeting.
C．The proposal should be sent back.
D．His support would have helped this morning.
单项选择题
A．The trouble of melting coniine oxide.B．The high price of it.C．The difficulty of spraying it on the engine parts.D．It being not environment-friendly.
A．The trouble of melting coniine oxide.
B．The high price of it.
C．The difficulty of spraying it on the engine parts.
D．It being not environment-friendly.
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