2. 外语
  3. A subject which seems not yet______by doctors and psychologists is the influence of geography and climate on the psychological a

A subject which seems not yet______by doctors and psychologists is the influence of geography and climate on the psychological a

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问题 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.
选项 A、to have been studied
B、to be studied
C、having been studied
D、being studied
答案A
解析 首先，seem to do sth．，不是seem doing sth．，据此排除C、D。不定式完成式与句中的not yet吻合，表达the subject hasn’t been studied yet的意思。
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