A、That; that
B、That; what
C、It; what
D、It; that
答案：D
A、That; that
B、That; what
C、It; what
D、It; that
答案：D
A. who is
B. who am
C. that is
D. what is
A. were
B. is
C. are
D. am
A. to take
B. taken
C. to be taken
D. taking
A. that you talked
B. you talked about it
C. which you talked with
D. you talked about
A. accept
B. accepted
C. should accept
D. would accept
A. when
B. where
C. what
D. that
A. do
B. does
C. did
D. would do
A. it
B. that
C. it is
D. that is
解析：这道题考察的是代词的用法。正确答案是A: it。
在这个句子中，"it" 作为形式宾语，代替了后面的不定式动词短语"to learn English grammar"。所以句子的正确表达应该是"I found it difficult to learn English grammar."，意思是"我发现学习英语语法很困难"。
A. in front of
B. in the front of
C. at the back of
D. at the beginning of
A. as results
B. which results
C. the results of it
D. the results of which
