9. Recent scientific studies have detected microplastics in human placentas, blood, and lung tissue, 9 can lead to serious health problems to people.
(A)that
(B)this
(C)what
(D)which

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統計: A(0), B(0), C(0), D(2), E(0) #3884949

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#7448290
正確答案:(D) which   ...
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