She raised her finger to her lips as _________ for silence. 
#7282
A
an idea
B
a mark
C
a sign
D
a word
推荐题目
David is a skillful worker. I’m sure he has enough _______ to fix all the electronic ______.
#5362
A
experience; equipment
B
experience; equipments
C
experiences; equipment
D
experiences; equipments
______ will Tom agree to change his mind about going abroad for further study. 
#6550
A
By all means
B
By no means
C
At some time
D
At any time