I believe reserves of coal here are ______ to last for fifty years.

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问题 I believe reserves of coal here are ______ to last for fifty years.

选项 A、efficient
B、sufficient
C、persistent
D、rich

答案B

解析 sufficient(for/to+动词原形)a.足够的,充分的。efficient a.效率高的,有能力的。persistent a.(定语或表语)持续的,顽强存在的;坚持不懈的,执意的。rich a.富有的,有钱的;富饶的,丰富的(in):肥沃的。
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