问题
选择题
The drug came under strong attack from _______ professional observers, who had been backed up by many doctors.
A．confused
B．confusing
C．concerning
D．concerned
答案
答案：D
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The drug came under strong attack from _______ professional observers, who had been backed up by many doctors.
A．confused
B．confusing
C．concerning
D．concerned
答案：D