问题
选择题
—Where're the children, Mr Black?
—Oh, they _______ their PE lesson on the playground. [ ]
A. have
B. had
C. are having
D. have had
答案
C
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—Where're the children, Mr Black?
—Oh, they _______ their PE lesson on the playground. [ ]
A. have
B. had
C. are having
D. have had
C