Mass deaths of birds were not unheard of, but they normally happened unnoticed at sea or in rural areas away from towns. Many birds are weak and die in winter _______ food is scarce.
#76616
A
which
B
what
C
when
D
how
推荐题目
I’m very grateful to my high school teachers, without ______ help I wouldn’t be so excellent.
#76421
A
whom
B
their
C
which
D
whose
Naturally a smile ________ the eyes participate is extremely communicative.
#75337
A
to which
B
in which
C
at which
D
with which
You have won the first prize in the game, ______ you didn’t mention in your speech yesterday.
#77668
A
as
B
since
C
what
D
which
“Simpler” books are the foundation ______ students build a lifelong habit of reading and further the actual skill of reading for longer and stronger periods of time.
#78488
A
which
B
upon which
C
for which
D
in which