请问大全

1.                             For many travelers, charter vacations often turn out to cost considerably more than they originally seemed.fficeffice" />

(A) they originally seemed

(B) they originally seem to

(C) they seemingly would cost originally

(D) it seemed originally（A）

(E) it originally seemed they would

    为什么B不对?不是seem to cost吗？

2、                             For protection from the summer sun, the Mojave lived in open-sided, flat-topped dwellings known as shades, each a roof of poles and arrowweed supported by posts set in a rectangle.

(A) each a roof of poles and arrowweed

(B) each a roof of poles and arrowweed that are being

(C) with each being a roof of poles and arrowweed

(D) with roofs of poles and arrowweed to be（A）

(E) with roofs of poles and arrowweed that are

    最好能详细解释一下整个句子的含义和结构

1.                             In an effort to reduce their inventories, Italian vintners have cut prices; their wines have been priced to sell, and they are.

(A) have been priced to sell, and they are

(B) are priced to sell, and they have

(C) are priced to sell, and they do

(D) are being priced to sell, and have（C）

(E) had been priced to sell, and they have

    C中的THEY到底指什么？

1.                             In good years, the patchwork of green fields that surround the San Joaquin Valley town bustles with farm workers, many of them in the area just for the season.

(A) surround the San Joaquin Valley town bustles with farm workers, many of them

(B) surrounds the San Joaquin Valley town bustles with farm workers, many of whom are

(C) surround the San Joaquin Valley town bustles with farm workers, many of who are

(D) surround the San Joaquin Valley town bustle with farm workers, many of which（A）

(E) surrounds the San Joaquin Valley town bustles with farm workers, many are

句中的surround 和bustles 都是动词，为什么单复不同？不是都修饰the patchwork of green fields 吗？而且中心词是the patchwork ，应该都用单数吧。