单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage.
What does "an ace in the hole" mean

A．Turning failure into success.
B．A winning card used at the right time.
C．The highest and most valuable card.
D．Anything kept fit until needed.

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单项选择题

单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. What does "an ace in the hole" mean 您的浏览器不支持 audio 元素。