单项选择题

  Some people viewed the findings with caution, noting that a cause-and-effect relationship between passive smoking and cancer remained ______.

A.to be shown
B.to have been shown
C.to have shown
D.being shown
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单项选择题
I’m ______ to think that they are opposed to the proposal.
A.leaned
B.included
C.inclined
D.declined
单项选择题
It can be inferred from the last paragraph that ______.
A.the issue of human cloning will soon be settled
B.some NBAC members hesitate to ban human cloning completely
C.privately funded researchers will respond positively to NBAC’s appeal
D.a law banning human cloning is to be passed immediately
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