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【参考答案】

将has改为have。
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单项选择题
A．They read poetry aloud.B．They delivered a speech..C．They took objective tests.D．They exchanged opinions with some people in a particular field.
A．They read poetry aloud.
B．They delivered a speech..
C．They took objective tests.
D．They exchanged opinions with some people in a particular field.
单项选择题
A．Simple tools are necessary for mankind.B．Simple tools can be very complicated.C．Simple tools are forgotten in the modem society.D．Modern technology are needed in the modem society.
A．Simple tools are necessary for mankind.
B．Simple tools can be very complicated.
C．Simple tools are forgotten in the modem society.
D．Modern technology are needed in the modem society.
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