Astronauts have to remember
Astronauts have to remember to close their mouths tightly________eating.
A before
B after
C while
D if
应该是D吧
参考答案:C
宇航员吃东西的时候,嘴巴要紧闭着
要不然食物就会跑出去了。。。
所以用while 当吃。。的时候
Astronauts have to remember to close their mouths tightly________eating.
A before
B after
C while
D if
应该是D吧
参考答案:C
宇航员吃东西的时候,嘴巴要紧闭着
要不然食物就会跑出去了。。。
所以用while 当吃。。的时候