was expected，only five people turned up at the party， disappointed the hostess very much.

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A. As；which
B. As；that
C. It；that
D. It；which
解析：A
解析　在非限制性定语从句中，当从句置于句首时，或从句意为“正如……”时，只能用as而不能用which来引导从句。C项和D项中第一空若要用it，则应把前半句改为“It was expected that only five people turned up at the party”此时it作形式主语。第二空是which引导的非限制性定语从句，且在从句中作主语。