单项选择题

What does the underlined word "they" in the fifth paragraph mean

A．Your clothes.
B．Your fingernail.
C．Tiny bits of dust.
D．Your shoes.
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单项选择题
A．allB．thatC．yearsD．work
A．all
B．that
C．years
D．work
单项选择题
A．ofB．thatC．aboutD．in
A．of
B．that
C．about
D．in
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