【題目】More trees to protect the environment.

A、must plant

B、must be planted

C、should plant

【答案】B

【解析】試題分析：句意：必須種植更多的樹來保護環(huán)境。A、must plant ，必須種植；B、must be planted 必須被種植；C、should plant 應(yīng)該種植。此處為情態(tài)動詞的被動語態(tài)。情態(tài)動詞的被動語態(tài)構(gòu)成：情態(tài)動詞+be+及物動詞的過去分詞。 故選B

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