15. For older people, doing exercises in swimming pools is especially helpful _____ the buoyant effect of water.
(A) because of
(B) because
(C) for
(D) since

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統計： A(151), B(20), C(37), D(5), E(0) #2510383

詳解 (共 1 筆)

#4670200
because是「連接詞」，後面會連接一...
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