The monument was built in honor of the explorer who was believed ________ the big river.
#88812
A
to have discovered
B
to have been discovered
C
to discover
D
having been discovered
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______ some of the questions ______,the man said good-bye to us.
#99019
A
Leave;unanswered
B
Leaving;unanswered
C
Left;to be answered
D
Leaving;unanswering
_______ in the war, many children have become orphans(孤儿).
#95733
A
Their parents were killed
B
Being killed
C
Their parents killed
D
Killed