单项选择题

______ of the two subjects in the experiment realized that they were being given placebos instead of the real medication.

(A) Most
(B) Either
(C) Several
(D) Neither
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单项选择题
The entrepreneur is ______, but his investors are beginning to doubt the business will remain profitable.
(A) optimistic
(B) alarmed
(C) familiar
(D) rewarding
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