【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】考查條件狀語從句。A. before在……之前；B. while當(dāng)……的時候；C. once一旦；D. though盡管。句意：一旦你掌握了它，你就不會覺得它很難了。故選C。

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