限制民事行为能力人订立的合同在何种情况下有效？

A. 间歇性外斜视
B. 共同性外斜视
C. 外斜V征
D. 麻痹性外斜视
E. 先天性外斜视

rveThe myor of smll town in southern Itly hs forbidden residents to die, ______ there is no grveyrd for them to be buried in.s if B．becuse C．if D．whereA．as ifB．becauseC．ifD．where