2. 外语
  3. Tourists often surprised at ______ so many flat and good roads in the mountainous regions.

Tourists often surprised at ______ so many flat and good roads in the mountainous regions.

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问题 Tourists often surprised at ______ so many flat and good roads in the mountainous regions.
选项 A、there are
B、there being
C、there to be
D、there were
答案B
解析 介词后面接名词或动名词做宾语。there is(或are)的动名词形式是there being，故B为正确答案。at后不能接从句，所以A和D都错。there to be是there be的不定式形式，不能做介词的宾语，故也错误。句意：看到山区有如此多的平坦大道，旅客感到很吃惊。
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