Generally speaking, the bird flying (across) our path is observed, and (the one) staying on the tree near (at hand) is passed by (without noticed).
A、
across
B、
the one
C、
at hand
D、
without noticed
【正确答案】
D
【答案解析】
without是介词，后面应该接名词或动名词，同时，该句又是被动的含义。所以应改为being noticed.
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