阿摩線上測驗
9. Recently, there have been several outbreaks of disease like legionnaire’s syndrome, and doctors don’t know ____.
(A) what is the cause
(B) the cause is what
(C) what the cause
(D) what the cause is
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統計： A(0), B(0), C(0), D(3), E(0) #3313182
統計： A(0), B(0), C(0), D(3), E(0) #3313182
