2. 职称英语
  3. The solution cannot be determined _____the problem is identified.A、ifB、whenC、u

The solution cannot be determined _____the problem is identified.A、ifB、whenC、u

游客2025-06-15  20
问题 The solution cannot be determined _____the problem is identified.
选项 A、if
B、when
C、until
D、which
答案 C
解析 Until indicates a time or an action that another action depends upon. Choice (A) is conditional and is not logical in the sentence. Choice (B) indicates a time relationship but is not logical in the sentence. Choice (D) is a relative pronoun.  
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