2. 外语
  3. The manufacture of rubber breathing pipes made it possible for divers______on the surface of the water.

The manufacture of rubber breathing pipes made it possible for divers______on the surface of the water.

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问题 The manufacture of rubber breathing pipes made it possible for divers______on the surface of the water.
选项 A、float
B、floating
C、to float
D、to be floated
答案C
解析 本题考查非谓语动词的用法，主句中的make要求后面用不定式，此处是不定式的复合形式。题意为，橡胶呼吸管的制造使得潜水者在水面上漂浮成为可能。
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