When winter comes, it _________ become very cold in Shenyang.
#101491
A
is going to
B
will
C
has
D
is about to
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The construction of the two new railway lines   by now.
#99633
A
have been completed
B
has been completed
C
has coompleted
D
have completed
I am so tired,for I ________ English for 2 hours.
#99761
A
is studying 
B
have been studying
C
was studying 
D
had been studying