Geologists (at) the Hawaiian Volcano Observatory (rely on) (a number of) instrum

游客2025-05-09 1

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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