多项选择题

If you had________ (听从了我的忠告，你就不会陷入麻烦).
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单项选择题
A．John has lost something at the railway stationB．There are several railway stations in the cityC．It will be very difficult for them to find JohnD．The train that John is taking will arrive soon
A．John has lost something at the railway station
B．There are several railway stations in the city
C．It will be very difficult for them to find John
D．The train that John is taking will arrive soon
单项选择题
The potential for hazardous weeds developing from genetically-modified plants is greatest for ______.
A．agricultural crops grown for their content
B．crops’’ that are closely related to their weeds
C．areas in which cross-breeding is kept to a minimum
D．crops who rely on herbicides and pesticides for effective harvests
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