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Truly speaking, even if English learners have memorized thousands of words and dozens of grammar rules, they can still （）upon a mysterious invisible block.

Truly speaking, even if English learners have memorized thousands of words and dozens of grammar rules, they can still （）upon a mysterious invisible block.
A.stumble
B.invisible
C.intentionally
D.equipped
正确答案：A

标签：英语口语直通车

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