1、B
固定结构be said to have done sth “据说已经...”的被动结构为：be said to have been done ”据说已经被...“
to后面必须先加动词原形,即使采用动词的完成结构,也应该是to have done sth或to have been done
2 C
suggest如果表示“建议”,其后的宾语从句必须采用虚拟语气,即从句的谓语动词由“should
+ 动词原形”构成,且should可以省略.
C not go = (should) not go
3 A
none为先行词,直接回答问句.
后面是none的定语从句.如果先行词是不定代词且指物时,只能用that做关系代词.
that代替none,在该定语从句中充当of的宾语.
4 D
because从句为现在时,排除A；
has后面两个并列宾语,用and连接,排除B；
money为不可数名词,不能用those代替,虽然volunteers可以,排除C.
5 B
allow doing sth 允许做某事；
allow sb to do sth 允许某人做某事.