All passengers ______ are expected to fasten the seat belts when the plane takes off and lands．
#27474
A
on aboard
B
on board
C
on the board
D
on boards
推荐题目
The key _____ four modernizations lies _____ the science and education.
#27570
A
to, on
B
of, on
C
to, in
D
of, in
Although the plan hasn’t been approved______ present, he insists______ carrying it out.
#25967
A
at; at
B
on; at
C
at; on
D
on; on
Most of the students got a favourable impression________the new teacher，and they were especially impressed________his humour and broad knowledge.
#25162
A
on；by
B
towards；with
C
of；with
D
to；with
The head engineer is in ________ the project .
#28306
A
his charge of
B
the charge of
C
charge of
D
one’s charge
_________ expressing her love for you, my sister has also expressed mine.
#29129
A
In
B
On
C
At
D
Beyond