4. The barbecue party ended two hours earlier than scheduled ______ the dark clouds looming over the beach suggested a thunderstorm and heavy rain.
(A) because
(B) because that
(C) because of
(D) because to
(E) for
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統計: A(11), B(6), C(9), D(0), E(0) #1087939
統計: A(11), B(6), C(9), D(0), E(0) #1087939