—You’ve dropped “s” in the word “acros”.—Oh, letter “s” should be doubled like this “acros

—You’ve dropped “s” in the word “acros”.
—Oh, letter “s” should be doubled like this “across”.
A. a ; a
B. an ; a
C. an ; the
D. the ; the

A. a ; aB. an ; a(答案→)C. an ; theD. the ; the解析：考查冠词，包括定冠词the和不定冠词a/an，第一个空表示一个字母s，所以是不定冠词；第二个空表示特指这个字母s，所以选C

这个解释是对的