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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.equipped
B.intentionally
C.invisible
D.stumble
正确答案：stumble

标签：英语口语直通车

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