问题: delighted
So biologists were _____early this year when,with the help of the Navy,they were able to _____a particular blue whale for 43 days,monitoring its
sounds.
A.delighting;keep track of
B.delighted;keep in touch of
C.delighting;keep an eye out
D.delighted;keep track of
解答:
D
So biologists were delighted early this year when with the help of the Navy they were able to track a particular blue whale for 43 days monitoring its sounds.
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