I’m sure Linda was very disappointed when she failed the ...

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I’m sure Linda was very disappointed when she failed the exam.

A. Linda needn’t be very disappointed when she failed the exam.

B. Linda must have been very disappointed when she failed the exam.

C. Linda may be very disappointed when she failed the exam.

D. Linda could have been very disappointed when she failed the exam.

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I________ buy that book because I didn’t bring any money with me.

A. can’t

B. couldn’t

C. may not

D. might not