问题
选择题
Noone has _____ been able to trace the author of the poem.
A．still
B．yet
C．already
D．just
答案
答案：B
yet 常用于现在完成时的否定句中, 意为“尚, 还”。
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Noone has _____ been able to trace the author of the poem.
A．still
B．yet
C．already
D．just
答案：B
yet 常用于现在完成时的否定句中, 意为“尚, 还”。