求教几个GWD上的语法啊，没答案

baby歙

T-9-Q13.987-184
Building large new hospitals in the bistate area would constitute a wasteful use of resources, on the basis of avoidance of duplicated facilities alone.

A.on the basis of avoidance of duplicated facilities alone

B.on the grounds of avoiding duplicated facilities alone

C.solely in that duplicated facilities should be avoided

D.while the duplication of facilities should be avoided

E.if only because the duplication of facilities should be avoided

正确E，C怎么错了？




T-9-Q27.大全987-606
Research during the past several decades on the nature of language and the processes that produce and make it understandable has revealed great complexity instead of underlying simplicity.



A.that produce and make it understandable has revealed great complexity instead of underlying simplicity

B.of producing and understanding it have revealed not underlying simplicity but great complexity

C.by which it is produced and understood has revealed not underlying simplicity but great complexity

D.by which it is produced and understood have revealed great complexity rather than underlying simplicity

E.by which one produces and understands it have revealed great complexity instead of underlying simplicity

正确A，C为什么？


T-9-Q29.987-637
Several studies have found that the coronary patients who exercise most actively have half or less than half the chance of dying of a heart attack as those who are sedentary.

A.have half or less than half the chance of dying of a heart attack as those who are sedentary

B.have half the chance, or less, of dying of a heart attack than those who are sedentary do

C.have half the chance that they will die of a heart attack, or less, than those who are sedentary do

D.are at least fifty percent less likely to die of a heart attack as those who are sedentary

E.are at least fifty percent less likely than those who are sedentary to die of a heart attack



正确E，B为什么？