One of her achievements is helping us understand _________ chimps ______ like humans.
#68761
A
how…act
B
whether … act
C
how much… behave
D
how much…approach
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_____several times,but unfortunately,the boy still couldn’t smooth away the problem on his own.
#73673
A
Having been explained
B
The problem having been explained
C
The problem had been explained
D
Although the problem had been explained
What ______ you ______ when you father came back?
#41367
A
did, do
B
are, doing
C
were, doing
D
do, do