The expert offered us another piece of advice,_____of great help to our program. 
#73723
A
I think it is
B
I think which is
C
which I think it is
D
which I think is 
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    I could not remember the text .
#68396
A
However hard did I try
B
However hard I tried
C
However I tried
D
However had I tried hard
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