2. 外语
  3. Geologists (at) the Hawaiian Volcano Observatory (rely on) (a number of) instruments to (studying) the volcanoes in Hawaii.

Geologists (at) the Hawaiian Volcano Observatory (rely on) (a number of) instruments to (studying) the volcanoes in Hawaii.

admin2010-12-06  50
问题 Geologists (at) the Hawaiian Volcano Observatory (rely on) (a number of) instruments to (studying) the volcanoes in Hawaii.
选项 A、at
B、rely on
C、a number of
D、studying
答案D
解析 改为study。句中to是不定式短语标志，后应接动词原形。
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