Question

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．

1. A.
   delighting：keep track of
2. B.
   delighted：keep in touch of
3. C.
   delighting：keep an eye out
4. D.
   delighted：keep track of

Answer 1

D
delighting意为“让……高兴的”，delighted意为“某人感到高兴的”：说明人的用delighted：keep track of“跟踪”。