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【单选题】
We may not install a new energy-efficient water heater this year.
A.
It sounds like you are completely certain that you aren't going to do it.
B.
It sounds like you are somewhat sure you aren't going to do it.
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】He ought to find a job after applying to so many companies.
A.
I'm glad you are very confident about his future.
B.
That's too bad. It sounds like you aren't very confident about his future.
【单选题】The dolphins cannot survive because of all the pollution in the oceans.
A.
That's so sad. I hate to hear that they are going to die.
B.
Well, at least it's reassuring to know that you aren't certain that all the dolphins are going to die.
【单选题】A: I think I saw John at the festival yesterday. B: He _____ there. He's in Tokyo.
A.
couldn't have been
B.
might not have been
【单选题】You _____ the test! You studied for so many hours.
A.
can't have failed
B.
may not have failed
【单选题】The police _____ the criminals right away, but they decided to watch them for a while instead.
A.
could have arrested
B.
must have arrested
【单选题】Linda didn't call yesterday as we had planned. She _____.
A.
must have forgotten
B.
must not have forgotten
【单选题】I didn't get any milk today, but I _____ now if you want.
A.
could have gone
B.
could go