18. Whenever I met him, _____ was fairly often, I like his sweet and hopeful smile.
A. what B. that C. which D. when
18. Whenever I met him, _____ was fairly often, I like his sweet and hopeful smile.
A. what B. that C. which D. when
C
选C。非限制性定语从句不用that，而应该使用which。本题中的which指代整个主句的内容。