[单选题]Guest: Oh, I hadn't realized how late it was. I'm afraid I'll have to be going. Host: Oh, not yet. I'm just going to make some coffee. Guest: ______ , though I'd really love to stay. I've got to be up by six tomorrow morning, unfortunately. Thank you for a wonderful party.

正确答案 ：A

I'm sorry, but I must

解析：解析：主人诚心挽留，客人坚持要走。由于不能接受主人的好意，客人应表示歉意，故而选择A．I'm sorry，but I must比较合理。其他选项使用场合不当。

[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]She got a ______ job while she was waiting to go to the university.

正确答案 ：C

temporary

解析：解析：本句的后半句话给出厂足够的信息，等待上大学之前找的工作肯定是“临时的”(temporary)。

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