(单选题)

______ it to clear up tomorrow, the tourists would climb to the top of the mountain to wait for the sun to rise.

A.If

B.Were

C.Should

D.Because

参考答案：B

参考解析：

考查与将来事实相反的虚拟语气。句意：如果明天放晴，游客会爬到山顶看日出。其一，根据句意以及主句“would climb”可知本题考查虚拟语气；其二，if虚拟条件句对于将来的虚拟，从句谓语动词应为“were to do; should do; did”的形式；其三，根据题干中的“to”，可选择“were to do”的结构，were提前，省略if。故选B。

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