2. 职称英语
  3. The classroom is empty, so the students________have gone to the laboratory.A、oug

The classroom is empty, so the students________have gone to the laboratory.A、oug

游客2023-09-29  63
问题 The classroom is empty, so the students________have gone to the laboratory.
选项 A、ought to
B、must
C、should
D、could
答案 B
解析 本题考查情态动词的用法。“情态动词+have done"表示对过去行为的推测。根据句意，must have done是对过去行为的肯定推测，符合题意。ought to／should have done sth．意为“过去应该做某事却未做”；could have done sth．用于虚拟语气，意为“本来能够做某事却未做”。
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