--How did you do in the test?--Not so well.I _____ much better but I misread the directions for Pa.—How did you do on the test?—Not so well.I much better but I misread the directions for Part F.A.could do B.could have doneC.must have done D.shoul

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--How did you do in the test?--Not so well.I _____ much better but I misread the directions for Pa.—How did you do on the test?—Not so well.I much better but I misread the directions for Part F.A.could do B.could have doneC.must have done D.shoul
--How did you do in the test?--Not so well.I _____ much better but I misread the directions for Pa
.—How did you do on the test?
—Not so well.I much better but I misread the directions for Part F.
A.could do B.could have done
C.must have done D.should do

--How did you do in the test?--Not so well.I _____ much better but I misread the directions for Pa.—How did you do on the test?—Not so well.I much better but I misread the directions for Part F.A.could do B.could have doneC.must have done D.shoul
B. 虚拟语气.对过去的情况进行反向推测,用“would/could +完成时”.