It is said in the book that Thomas Edison (1847—1931) ________ the world-leading inventor for sixty years. 
#104751
A
would be
B
has been
C
had been
D
was
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Hurry! The plane ______ . You know, it ______at 3:15.
#100058
A
takes off, takes off
B
is taking off, takes off
C
takes off, is taking off
D
is taking off, is taking off
Mike           with Janet for over one year before they got married.
#100050
A
had fallen in love
B
had been in love
C
has fallen in love
D
has been in love