He said that the group ________ him a letter and asked him to go there for an interview.
A、havewrittenB
“写信给他”应该发生在他说话之前，也就是过去的过去，用过去完成时。
Thisisanimportantproblem_______toofewsocialscientistshaveresearched.
Country life is better than city life ________ it offers fresh air and noiseless environment
Linguistscanconcentrateonalltheaspectsoflanguageatonce.
______ of a sentence depends on the context in which the sentence is uttered.
Childrenhaveanatural________abouttheworldaroundthem.
