板蓝根可用于治疗（）
A.外感发热
B.瘟毒发斑
C.咽喉肿痛
D.痄腮
E.丹毒
参考答案：A, B, C, D, E
Paul doesn’t have to be made_______. He always works hard. [ ]
A. learn
B. to learn
C. learned
D. learning
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