阿摩線上測驗
31. Drinking water ___________essential for good health.
(A)is
(B)are
(C)that is
(D)that are
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統計： A(360), B(7), C(14), D(3), E(0) #1784683
統計： A(360), B(7), C(14), D(3), E(0) #1784683
