12. Asthma, ____ medical condition that makes it difficult to breathe, can be triggered by any pollutant in the air.
(A)a
(B)it is a
(C)that a
(D)is a

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統計： A(2), B(0), C(0), D(0), E(0) #3314081

詳解 (共 1 筆)

#6883354
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