Designers are experimenting with a new material______flexibility with lightness.

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问题 Designers are experimenting with a new material______flexibility with lightness.

选项 A、is combining
B、has combined
C、that combines
D、combination of

答案C

解析 横线前已经构成完整的结构,这说明flexibility with lightness修饰material。横线处应填入(C)that combines,形成定语从句。
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