.We will learn how to operate the machine _______.
#4731
A
at a time
B
at one time
C
at the time
D
in time
推荐题目
This is Ted’s photo. We miss him a lot. He ______ trying to save a child in the earthquake.
#4951
A
killed
B
is killed
C
was killed
D
was killing
The experiment show that proper amount of exercise, if ________ regularly, can improve our health.
#4536
A
carry out
B
carried out
C
to carry out
D
being carried out
_________ the flight to New York will be delayed is _________ I’m especially worried about.
#4625
A
If; what
B
Whether; that
C
When; that
D
Whether; what
The research is so designed that once________nothing can be done to change it.
#5001
A
begins
B
having begun
C
beginning
D
begun