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【題目】You won't find it difficult ______ you have mastered it.
A.before
B.while
C.once
D.though

【答案】C
【解析】句意：一旦你掌握了它，你就不會覺得它很難了。A. before在……之前；B. while當……的時候；C. once一旦；D. though盡管。根據(jù)句意可知選C。

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