题目内容
（请给出正确答案）
[主观题]
I believe reserves of coal here are ______ to last for 50 years.A.sufficientB.efficientC.e
I believe reserves of coal here are ______ to last for 50 years.
A.sufficient
B.efficient
C.enough
D.full
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A.capable of
B.able to
C.ability of
D.capacity of
