It may be 5 or 10 years __________ it is possible for people to find a space station on the moon.
A．sinceB．beforeC．a(chǎn)fterD．when
B

試題分析：考查連詞和句型：A. since 自從，B. before 在…前面，C. after在…后面，D. when當(dāng)…時(shí)候，句意：可能還要5-10年人們才能發(fā)現(xiàn)月球上有個太空站。使用了句型：It may be+一段時(shí)間+before….“要…長時(shí)間才能夠”，選B。
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