Mr. Smith was so angry at all ______ Bill was doing ______ he left.
A.that; what
B.that; that
C.which; which
D.what; that
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B解析主要测试宾语从句。由句子的语境可知译文为：史密斯先生对比尔做的他让比尔做的事情如此生气。第一空主要测试定语从句，并且先行词为不定代词all，只能选择关系代词that；第二空主要测试宾语从句：句子______ he left中需要动词leave的宾语，同时动词do也需要宾语，双重作用的引导词只能是what。