China sent up Shenzhou Ⅸ manned spaceship into space successfully, which shows science and technology ______ rapidly in China.
#100611
A
have been developing
B
have developed
C
has been developed
D
is developing
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The new bridge ________ by the end of last month.
#101340
A
has been designed
B
had been designed
C
was designed
D
would be designed
 Mary ______ to see you . She _____ for you downstairs at the moment . 
#104620
A
has come ; is waiting
B
came ; is waiting
C
has come ; waited
D
came ; was waiting
 The room _______ very useful when we had visitors.
#101127
A
was proved
B
has been proved
C
has proved
D
proved