问题补充：
it to clear up tomorrow, the tourists would climb to the top of the mountain to see the sun .
A. If; to raise
B. Were; rise
C. Should; rise
D. If; raising
答案：
A. If; to raise
(答案→)B. Were; rise
C. Should; rise
D. If; raising
解析：句意：如果明天放晴，游客会爬到山顶看日出。从主句would climb可知这里是虚拟语气，if条件句可以用省略倒装，因为句中用to，所以是和将来相反的情况，用were to do，were可以提前，省略if，第二空用see +宾语+省略to的不定式，表示看见…做了，选B。
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