请教3道GWD语法题～

GWD1-Q2:

By merging its two publishing divisions, the company will increase their share of the country’s $21 billion book market from 6 percent to 10 percent, a market ranging from obscure textbooks to mass-market paperbacks.

A.    their share of the country’s $21 billion book market from 6 percent to 10 percent, a market ranging

B.    from 6 percent to 10 percent its share of the $21 billion book market in the country, which ranges

C.    to 10 percent from 6 percent in their share of the $21 billion book market in the country, a market ranging

D.    in its share, from 6 percent to 10 percent, of the $21 billion book market in the country, which ranges

E.     to 10 percent from 6 percent its share of the country’s $21 billion book market, which ranges

我选了E，但答案是B。但我觉得B的which指代不如E的清晰啊……

GWD1-Q7:

A recent review of pay scales indicates that CEO’s now earn an average of 419 times more pay than blue-collar workers, compared to a ratio of 42 times in 1980.

A.    that CEO’s now earn an average of 419 times more pay than blue-collar workers, compared to a ratio of 42 times

B.    that, on average, CEO’s now earn 419 times the pay of blue-collar workers, a ratio that compares to 42 times

C.    that, on average, CEO’s now earn 419 times the pay of blue-collar workers, as compared to 42 times their pay, the ratio

D.    CEO’s who now earn on average 419 times more pay than blue-collar workers, as compared to 42 times their pay, the ratio

E.     CEO’s now earning an average of 419 times the pay of blue-collar workers, compared to the ratio of 42 times

答案是C，我选了A。其实不大理解句子结构，那个CEO's是什么东西…

GWD1-Q32:

To develop more accurate population forecasts, demographers have to know a great deal more than now about the social and economic determinants of fertility.

A.    have to know a great deal more than now about the social and economic

B.    have to know a great deal more than they do now about the social and economical

C.    would have to know a great deal more than they do now about the social and economical

D.    would have to know a great deal more than they do now about the social and economic

E.     would have to know a great deal more than now about the social and economical

答案是D。可是would和now怎么会共存？

唉，做第一套光语法就错了3道，郁闷……

唉，做第一套光语法就错了3道，郁闷……