36. Scientists at the Los Alamos National Laboratory have succeeded for the first time in mining heat from the Earth’s interior and producing energy on a commercial scale, enough for efficient generation of electricity and heating factories and homes. A. and producing energy on a commercial scale, enough for efficient generation of electricity and heating B. and producing enough energy on a commercial scale for electricity to be generated efficiently and to heat C. for energy production on a commercial scale, enough for generating electricity efficiently and to heat D. to produce energy on a commercial scale, enough for generating electricity efficiently and for heating E. to produce enough energy on a commercial scale for efficient generation of electricity and heat the answer is D I'm quite uncomfortable with the "enough for" in answer D...any NN could help to explain the usage? thanks. |