He ____________ German very well. He's only lived in Germany for one month.a) could speakb) can't speakc) isn't bound to speakd) can't have spoken

To answer the question, we need to consider the context provided. The sentence states that the person has only lived in Germany for one month, which implies that it is unlikely for them to speak German very well. Let's analyze each option:

a) "could speak" - This suggests a possibility or ability in the past, which doesn't fit the context of only one month in Germany. b) "can't speak" - This suggests an inability to speak German, which aligns with the context of only one month in Germany. c) "isn't bound to speak" - This phrase is awkward and not commonly used in this context. d) "can't have spoken" - This suggests an impossibility in the past, which doesn't fit the context of the sentence.

The most appropriate choice is:

b) can't speak

So, the complete sentence is: "He can't speak German very well. He's only lived in Germany for one month."