Kate  ________    on her new novel, which is supposed to come out next month.
#63761
A
was working
B
had worked
C
will be working
D
has been working
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 Up to now, our society ________ with limited living space and a shortage of natural resources.
#63760
A
has been challenged
B
is being challenged
C
is challenging
D
has challenged
He complained that this was the third time he            of the changes of the meeting date.
#63781
A
would be informed
B
was informed
C
has been informed
D
has been informed
— Alvin,are you coming with us?—I'd love to,but something unexpected ________.
#63769
A
has come up
B
was coming up
C
had come up
D
would come up
They ______Hong Kong twice.  
#63785
A
have gone to
B
have been to
C
have been in
D
have gone in