The Diaoyu Islands _____ in Chinese maps since the 14th and 15th centuries.
#100503
A
have been included
B
had been included
C
were included
D
are included
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Large quantities of oil      in a place near my hometown recently. 
#102718
A
has discovered
B
have discovered
C
has been discovered
D
have been discovered
Helen ________ her keys in the office so she had to wait until her husband ______ home. 
#101502
A
has left; comes
B
left; had come
C
had left; came
D
had left; would come