The famous reporter, who is said to go back to America next month, _____in China for almost twenty years. 
#63756
A
lived
B
was living
C
has lived
D
had lived
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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
 The house is dirty because it ________ since they moved out.
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A
doesn't clean
B
isn't cleaned
C
hasn't cleaned
D
hasn't been cleaned
 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