make sure that there is no blockage in the pipe.A、 make sure that there is something in the pipe.B、 make sure that there is nothing in the pipe.C、 make sure that blockage is in the pipe.-易过题库-题库最全的搜题网站

make sure that there is no blockage in the pipe.

A make sure that there is something in the pipe.

B make sure that there is nothing in the pipe.

C make sure that blockage is in the pipe.

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