You shouldn’t accept a gift from a person _____ you don’t know him.
#31530
A
until
B
unless
C
if
D
whether
推荐题目
--Shall Mary come and play computer games?--No,__________ she has finished her homework.
#80320
A
when
B
if
C
unless
D
once
The woman was about to open the door ____________ she heard a strange sound from inside.
#32002
A
as
B
while
C
when
D
then
—Dad, I've finished my assignment.—Good，and ________you play or watch TV, you mustn't disturb me.
#29979
A
whenever
B
whether
C
whatever
D
no matter
--Haven't you seen Mr. Wilson at the lecture? --Yes, but he had left _________ I could ask him any questions.
#31720
A
when
B
before
C
after
D
as