1). When determining the cause of a serious, ( ).
A.the patient should be given good care by the doctor
B.the illness should be treated ct once by the doctor
C.the doctor should be giving the patient good care
D.the most effective treatment should be given by the doctor
正确答案：C
答案解析：
2). Every means( )since then.
A.has been trying
B.have been trying
C.have been tried
D.has been tried
正确答案：D
答案解析：means (方式，方法)作主语，谓语动词用单数形式。
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