I________admit the plan is a limited one and is not as successful as we thought.

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问题 I________admit the plan is a limited one and is not as successful as we thought.

选项 A、can
B、may
C、need
D、must

答案D

解析 句意:我必须承认这个计划很有限,不如我们所想的那么成功。can能;may可能(语气上弱于can);need需要;must必须(通常虚拟语气)。题中表达的是“必须”的含义,故D正确。
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