Watching the online open courses of some famous European and American universities _______a new fashion among white collars in China over the past few months.
#102958
A
became
B
had become
C
has become
D
becomes
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In order to reduce the increasing prices of vegetables，the toll(过路费) if a truck carrying them passes through a toll sration.
#99634
A
cancels
B
is canceiled
C
was cancelled
D
had been cancelled
With Chang'e-3 successfully landing, China becomes the third country in the world that _______ on the moon.
#99884
A
lands
B
has landed
C
landed
D
was landing
—Did you find the missing couple in the mountain yesterday?—No, but we ______ to get in touch with them ever since.
#100903
A
had tried
B
have tried
C
have been trying
D
had been trying
When I talked with my grandma on the phone, she sounded weak, but by the time we ______ up , her voice had been full of life.
#101651
A
were hanging
B
had hung
C
hung
D
would hang