29.It was a great ____ for him to be pleasant to people who

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29.It was a great ____ for him to be pleasant to people who he didn't know.
A.trouble
B.effort
C.sorrow
D.horror
请问这道题为什么不能选择A
33.The late Chinese leader Deng Xiaoping was recognized as the ____ Architect of China's reform,opening and modernization.
A.Main
B.Chief
C.Principal
D.Primary
请问这道题为什么不能选择C
BB

29题
effort可以做可数名词,也可做不可数名词
当做不可数名词时,意思是“力量,精力”；当做可数名词时,意思是“努力,奋斗,努力的结果”.与这道选择题相似,还有一个例子,It was a real effort to stay awake through the film.（真要强打着精神才能看完整部电影）
trouble除了是动词以外,还可以是名词,但是大部分情况下是不可数名词,当解释胃“动乱,纷争”时,可以为可数名词
33题
principal一般指某些教育机构（通常属继续教育性质）之领导人

It was a great _____ for him to be pleasant to people he did It was a great _____for him to be pleasant to people he didn It was a great_for him to be pleasant to people who he didn' It would be a great ____ ____ for him to teach in a country Linda thought it was ____ great honor to be chosen to be a v 英语开头字母填空It should be a pleasant experience for people who ca it was ____ great fun to be a volunteer,wasn't it A site had to be found for it.It was necessary ____ for it It's ____ for me to see you.A.glad B.pleased C.pleasant D.pl 语法题It was ( ) pleasant weather ( ) we decided to go for a pi He is a famous singer.It is ____ for young people to be his please get ____?a .it for him b.him it c.it to him d.him to