托福语法Seldomgamesbeenofpraticaluseinplayingrealgames.A.theoriesofmathematicsB.theorizedasmathematicsC.hasthemathematicaltheoryofD.themathematicaltheoryhas这个答案上给的是C,可是这个应该怎么解释?

Question

托福语法
Seldom ___ games been of pratical use in playing real games.
A.theories of mathematics
B.theorized as mathematics
C.has the mathematical theory of
D.the mathematical theory has
这个答案上给的是C,可是这个应该怎么解释?

Answer 1

填 A, B ,句子的谓语动词不完整,只有 been,缺少 “verb to have”的相应字；
填 D,出现莫明其妙的谓语 “…themathematical theory has games been”,把“games”
如此插入 “has been”中是不符合语法的.
填 C,…… has the mathematical theory of games been……
是部分倒装的句子,可还原为：
Seldom the mathematical theory of games has been of ……
句子通顺符合文法.