8．There are still many problems to be solved            we are ready for a long stay on the Moon．（　　）
A．onceB．beforeC．afterD．until

分析 在我們準(zhǔn)備在月球上進行長時間停留之前還有很多問題待解決．

解答 答案：B
解析：A：一旦；B：在…之前；C：在…之后；D：直到．根據(jù)句意"在我們準(zhǔn)備在月球上進行長時間停留之前還有很多問題待解決"及所給選項分析可知，本題答案為B選項；其余選項均不符合題意．

點評 本題考查連詞的辨析，做此類題目時一定要清楚各個選項的含義及用法，再結(jié)合句意及其它要求確定最終答案．

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