In time of serious accidents, ________ we know some basic things about first aid, we can save lives.
#30162
A
whether
B
until
C
if
D
unless
推荐题目
Is this the reason ___ at the meeting for his carelessness in his work?
#80561
A
he explained
B
what explained
C
how he explained
D
why he explained
_____but he still couldn’t understand the logical connection of the two subjects.
#30645
A
Having told many times
B
Having been told many times
C
He was told many times
D
Many times as he was told