You must let your manager understand the details of the feasibility study ______

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问题 You must let your manager understand the details of the feasibility study ______ by 5 o’clock this afternoon.

选项 A、without fail
B、without trouble
C、without failure
D、without difficulty

答案 A

解析 without fail是固定短语，意思是“必定，一定”，符合本题的题意。without difficulty的意思是“毫不费力地”，填入后，意思上讲不通。without trouble和without failure均不是固定的短语结构形式。

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