问题
选择题
—John, you _____ go out to play until your homework _____.
—OK, Mum.[ ]
A. must; finishes
B. can't; is finished
C. can't; has finished
D. needn't; finishes
答案
答案：B
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—John, you _____ go out to play until your homework _____.
—OK, Mum.[ ]
A. must; finishes
B. can't; is finished
C. can't; has finished
D. needn't; finishes
答案：B