问题
选择题
Countries are looking for new clean fuels, such as solar energy, ________their homes in winter. [ ]
A. to heat
B. heating
C. heated
D. having heated
答案
答案：A
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Countries are looking for new clean fuels, such as solar energy, ________their homes in winter. [ ]
A. to heat
B. heating
C. heated
D. having heated
答案：A