The earth is our home. It ______________ well.
A．must be protectedB．should protectC．need protectD．need protecting
A

試題分析：句意：地球是我們的家。它應(yīng)當(dāng)被保護(hù)好。本句的主語(yǔ)是the earth，所以使用被動(dòng)語(yǔ)態(tài)。含有情態(tài)動(dòng)詞被動(dòng)語(yǔ)態(tài)的基本形式是：情態(tài)動(dòng)詞+be+實(shí)義動(dòng)詞的過(guò)去分詞。
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