The vocabulary and grammatical differences between British and American English are so sli

问题补充：

The vocabulary and grammatical differences between British and American English are so slight and few as hardly .

A. to notice

B. being noticed

C. noticed

D. to be noticed

答案：

A. to notice

B. being noticed

C. noticed

(答案→)D. to be noticed

解析：考查动词不定式。题意：英式英语和美式英语语法词汇差异很小，很少被人注意。全句是一个固定句式：so + adj. / adv. + as to do sth. as to do sth.在句中用做结果状语。