Question

【題目】This kind of robot _____help people do dangerous work.

A. used toB. was used toC. used forD. was used for

Answer 1

【答案】B

【解析】

句意：這種機(jī)器人被用來幫助人們做危險的工作。A. used to過去常常；B. was used to被用來做某事；C. used for用于；D. was used for被用于……。for是介詞，因此后面跟動名詞，help是動詞原形，所以排除C/D；主語This kind of robot與use之間存在著被動關(guān)系，因此應(yīng)該用被動句。故選B。