【題目】Which things ______ by common people to protect the environment?
A.can be
B.can do
C.can be done
D.can be do

【答案】C
【解析】根據(jù)句意，which things做主語，是被動語態(tài)，情態(tài)動詞的被動語態(tài)由情態(tài)動詞+ be +動詞的過去分詞，故選C。

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