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
网友回答
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。