When products made in factories _____, they are thrown away as garbage.
A.e to an end
B.are put to use
C.are used up
D.wear out
网友回答
D解析wear out本题中意指（bee useless form continued use of wear）用坏，穿破，如：The machine will soon wear out.(这机器即将用坏。)e to and end(结束)，put ... to use(投入使用), use up(用完)， e into use(开始投入使用)。