几道英语单选
1.（ ）convincing an argument is,it needs support of evidence.
A.Whatever
B.However
C.Although
D.Even if
2.You'd better give the task to ( )he believed had a strong sense
of responsibility.
A.whom
B.whomever
C.whoever
D.that
3.( )has recently been done to improve the conditions of elementary schools a great number of children are unable to go school.
A.That
B.What
C.In spite of what
D.Though what