【题目】My sister has made ______ great progress in her spoken English that she can now talk freely with foreigners.
A.so
B.too
C.such
D.quite

【答案】C
【解析】so/such...that“如此……以致于……”，progress为不可数名词，故用such修饰；句意：我妹妹在英语口语方面取得了如此大的进步以致她现在能自由地与外国人交谈。根据句意，故选C。