As the busiest woman in the village, she made _____ her duty to look after all the other people’s affairs in that village.
#92763
A
this
B
that
C
one
D
it
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 It never _____  humans until the mid­1990s that some animals can be cloned.
#92718
A
occur
B
is occurred
C
occurred to
D
occurred
We congratulated Jerry ____ the championship.
#92995
A
on winning
B
winning
C
to win
D
about winning
Last summer I took a course on _______ poisonous gases.
#92450
A
how to deal with
B
what to deal with
C
how to be dealt with
D
what to be dealt with