Engines are to machines _________ hearts are to animals. 
#73870
A
as
B
that
C
what
D
which
推荐题目
The pen ______he is writing is mine. 
#73790
A
with which
B
in which
C
on which
D
by which
May and susan are twins and I can’t tell_____is_____.
#73040
A
which ;who
B
which ;which
C
who ;whom
D
whom ;who
— Shall I give you a ride since you live so far away?— Thank you. _______.
#70289
A
It couldn’t be better
B
Of course you can
C
If you like
D
If you are convenient