A subject which seems not yet______by doctors and psychologists is the influence of geogra
专四
已帮助 人
A subject which seems not yet______by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind.
A．to have been studied
B．to be studied
C．having been studied
D．being studied
请帮忙给出正确答案和分析，谢谢！
-
正确答案：A
首先，seemtodosth．，不是seemdoingsth．，据此排除C、D。不定式完成式与句中的notyet吻合，表达thesubjecthasn’tbeenstudiedyet的意思。