C．As

　　D．What

　　答案：C

　　解析：考查定语从句。选择定语从句的引导词的关键是：在主句中找出先行词。该句中定语从句的先行词是后面的整个句子people in Chinese mainland sent disaster relief materials to help the flooded area in Taiwan Island，当先行词为整个句子时，用关系代词which或者as，但which不可以放在句首，故选C项。

　　5．—Sorry, sir. I can't answer this question.

　　—Well, you are supposed ______ this part of history.

　　A．reading

　　B．to be reading

　　C．to have read

　　D．having read

　　答案：C

　　解析：be supposed to have done 表示“本来应该已做了某事，但可能没做”。

　　6．In a room above the store, where a party ______， some workers were busily setting the table.

　　A．was to be held

　　B．has been held

　　C．will be held

　　D．is being held

　　答案：A

　　解析：考查时态和语态。根据 some workers were busily setting the table 判断，聚会还没有举行，应用将来时态，且整个句子用过去时，故用过去将来时态。

　　7．(2010·北京海淀期末)When I couldn't avoid meeting him, I faced an embarrassing situation ______ I could only keep silent.

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