With all your brains you______the math test, but you failed. You were too careless.

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问题 With all your brains you______the math test, but you failed. You were too careless.

选项 A、should pass
B、should have passed
C、must pass
D、must have passed

答案B

解析 should+完成时:应该做的事情而没有做。must+现在完成时表示对已发生的事情的一种肯定的猜测。should do应该做;must do必须做。
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