單格填空第 54 題
The geologist suggested that as the most productive oil reservoirs begin to dry up, the high costs and potential risks of drilling in more marginal locations will come to seem less ______ and more acceptable.
| Blank |
|---|
| (A) efficacious |
| (B) onerous |
| (C) paltry |
| (D) redundant |
| (E) auspicious |
出處：PP3, Section 3, #2