题干
— What a nice dress! It fits you well.
— Thank you. It ______ me seven hundred yuan. I like its design.
A：paid
B：spent
C：took
D：cost
答案(点此获取答案解析）
D
— What a nice dress! It fits you well.
— Thank you. It ______ me seven hundred yuan. I like its design.
A：paid
B：spent
C：took
D：cost
的积为纯虚数，则实数a等于 （ ）