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No one has _____ been able to trace the author of the poem.

        A. still        B. yet            C. already       D. just

B


解析:

yet 常用于现在完成时的否定句中, 意为“尚, 还”。

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42    A    shared                  B       mixed                 C     threw                   D.      made
43  A    caught                  B       approached          C     limited                 D.      called
44    A    shelter                  B       talk                     C     rest                      D.      cookie
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54    A    generous              B       nice                    C     simple                  D.      political
55    A    decision                 B   choice                  C     difference             D       invention

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