求解释一道选择题,答案说的不清楚,说句中少谓语,难道 can be used 不是谓语吗?
Unlike fossil fuels, which can be used only once, wind and solar power _______ of energy.
A. for renewable sources
B. the sources are renewable
C. are renewable sources
D. renewable sources
严格来说,应该说主句缺少谓语,因为 can be used 是定语从句的谓语。
咱们把从句及次要部分去掉就清楚了:
Wind and solar power are renewable sources of energy.