[单选题]I don't know his address, ______.

正确答案 ：B

otherwise I would write to him

解析：解析：在otherwise或or引导的并列分句中用虚拟语气。此时，otherwise或or引导的并列句相当于非真实性条件句中的主语部分，前一分句暗示了现在的情况，因而在 otherwise引导的分句中要用与现在事实相反的虚拟语气。

[单选题]Martin: Can you cover for me on Sunday? I'm supposed to teach the high school class. Lisa: Sure. ______ ? Martin: We're going to the beach for the weekend. Lisa: Well, don't worry. I'll take good care of Sunday school.

正确答案 ：C

What's up

解析：解析：对话中，Lisa同意帮Martin的忙，接下来Martin解释说要去海滩度周末。可见 Lisa在前面可能问他去做何事。C．What's up? 在口语中常用来表示“你怎么了?”“有什么事?”符合题意。

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