Oil and natural gas exist on this planet in a limited supply. Therefore, it is essential for us to develop _____ to these nonrenewable energy sources.
Aalternatives正確答案
Bexplosives
Cinfinitives
Drelatives
答案與詳解
為什麼答案是 A
alternatives 意為替代品、替代方案，符合題幹尋找不可再生能源替代品的語意，且常與介系詞 to 連用（alternatives to...）。
載入中…
