Thiskindofseeds___cool,cleananddryaccordingtotheinstruction.A、shouldbecarriedB、mustbeputC、shouldbeplacedD、mustbekept
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题目内容：
This kind of seeds ___ cool,clean and dry according to the instruction.
A、should be carried B、must be put C、should be placed D、must be kept
优质解答
D
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