The doctor’s efforts were _________.The patient refused to accept the treatment.

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问题 The doctor’s efforts were _________.The patient refused to accept the treatment.

选项 A、of no avail
B、in no avail
C、by no avail
D、on no avail

答案 A

解析 avail意为“效用，利益”,of no avail为固定搭配，意为“没有一点儿效果”，故选A。

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