No one really knows for sure ________ makes a person become right-handed rather than left-handed.
#78859
A
whatever
B
who
C
what
D
whoever
推荐题目
Can you tell me____ last year ?
#79314
A
where does Mary work
B
where did Mary work
C
where Mary works
D
where Mary worked
 I’m writing to ask ______ you can do me a favor. 
#78994
A
that
B
what
C
where
D
whether
The timetable(时刻表) tells us __________________________every day. 
#38240
A
when does the train arrive
B
when the train will arrive
C
when will the train arrive
D
when the train arrives