单选题 Both the tenant and the owner share the responsibility of______the safety and cleanliness of the apartment.
【正确答案】 B
【答案解析】解析:介词of后面的宾语应为名词形式,因此选动词assure(确保)的动名词形式(B)assuring。(A)和(D)为动词形式,(C)为动词的过去分词,都不能与of搭配。作为参考,应知道the safety and cleanliness of the apartment是assuring的宾语。