There is no doubt _______ nearsightedness is a serious problem among the youth of our country.
#67052
A
/
B
which
C
whether
D
that
推荐题目
A 7-year-old boy received an operation on Tuesday successfully _______ he has many other health problems.
#67671
A
since
B
however
C
though
D
therefore
It was the training ________ he had as a young man ________ made him so excellent.
#69940
A
what; that
B
that; which
C
that; what
D
which; that