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。
Linguistscanconcentrateonalltheaspectsoflanguageatonce.
Weather _______, we ’ll go out for a walk.
Thisisanimportantproblem_______toofewsocialscientistshaveresearched.
This is an important problem _______ too few social scientists have researched.
Johnson was ________ unknown before running for the presidency.
