He spoke ________ fast ________ I couldn't understand him．A.so; thatB.too; toC.very; toD.such; that
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A解析so…that…引导结果状语从句，so后接形容词或副词，意为“如此……以致于……”．B项和C项不符合语法规则．such…that…也可引导结果状语从句，但such后接名词．例如：Mike is such a clever boy that everybody likes him．麦克是如此聪明的男孩，大家都很喜欢他．