It puzzles the scientists _____ some mammals produce their young _____ others lay eggs.
#30772
A
that; while
B
what; while
C
that; as
D
what; as
推荐题目
I was so familiar with her that I recognized her voice I picked up the phone.
#80255
A
the moment
B
after
C
before
D
while
Give yourself 10% of________is left for your work and let me have the rest.
#31043
A
which
B
that
C
what
D
where
---- When did the couple die? ---- It was on May 12 _______ the earthquake hit Wenchuan County.
#33030
A
that
B
which
C
when
D
what