2. 外语
  3. In the coming years, there are about 10,000 square kilometers of the designated search area still ________by sonar equipment tow

In the coming years, there are about 10,000 square kilometers of the designated search area still ________by sonar equipment tow

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问题 In the coming years, there are about 10,000 square kilometers of the designated search area still ________by sonar equipment towed from ships.
选项 A、scanned
B、be scanned
C、having been scanned
D、to be scanned
答案D
解析 不定式用法题。不定式的用法是专四高频考点。在there be句型中，真正主语为about 10，000 square kilometers of the designated search area，still…from ships是对主语的限定和修饰。由句首的时间状语In the coming years可以确定，本句所描述的是未来的行为或状态。四个选项中只有动词不定式结构可以表示“将要发生”，而该地区是被扫描，需要使用被动语态，故D为答案。
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