4. The volunteers __ distributed supplies at the emergency shelter to make sure they could help as many people as possible.
(A) vainly
(B) illegibly
(C) keenly
(D) frugally
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統計: A(0), B(0), C(1), D(0), E(0) #3372980
統計: A(0), B(0), C(1), D(0), E(0) #3372980