问题
选择题
It is uncertain ________ side effect the medicine will bring about，although about two thousand patients have taken it．[ ]
A．that
B．what
C．how
D．whether
答案
答案：B
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It is uncertain ________ side effect the medicine will bring about，although about two thousand patients have taken it．[ ]
A．that
B．what
C．how
D．whether
答案：B