Arctic terns, being true long-distance migrants, they nest in coastal wetlands of northern Europe but fly south for thousands of miles to spend the European winters in Antarctica.

A. Arctic terns , being true long distance migrants, they nest in coastal wetlands of northern Europe
B. Arctic terns are true long distance migrants, nesting in coastal wetlands of northern Europe
C. Being that they are true long distance migrants, arctic terns nest in coastal wetlands of northern Europe
D. Nesting in coastal wetlands of northern Europe, arctic terns are true long distant migrants
E. True long distance migrants, arctic terns nest in coastal wetlands of northern Europe

答案是C，我选的是E。不明白E错在哪里，感觉C没有E简洁。

"True long distance migrants" cannot modify "arctic terns" without any

participles (verb-ing). If you change it to "Being true long distance

migrants", then it's modifying "arctic terns" properly. Hence, C is the

better answer.

Hope this helps. =)