A dark cloud is a ________ of thunderstorm.
#6254
A
symbol
B
sign
C
mark
D
signal
推荐题目
This ____ of trousers ____ fit me. Please show me ____.
#6998
A
suit, isn't , another
B
pair, doesn't , another pair
C
one, isn't . another one
D
kind, don't , another
Sir, you are not allowed to enter the building unless you get our manager’s__.
#6250
A
permission
B
connection
C
instruction
D
introduction