请教几道PP语法

sarla

1.The femur is the ________in the body.
Ø    A. bone is the largest and longest
Ø     B. largest and longest bone that
Ø     C. largest and longest bone
Ø     D. bone largest and longest and
本人认为是C, 可ETS给的答案是B
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2.Develop (from) the medieval mandola, the modern mandolin has four pairs of (string) tuned to violin pitch (and produces) a clear, (bright) tone.
为什么答案会是B

4. Intricate (choreographer) emphasized the beauty and virtuosity (of the) nineteenth-century prima ballerina, while the male (dancer functioned )only as her partner (until) the twentieth century.
为什么会是A
谢谢大家！

xiang1jp

1. I chose C too.
2. string -> strings
3. choreographer -> choreographers

sarla

o. i got it. thank you!