Listen! The girls ________ in the next classroom. [ ] A. sing...
Listen!Thegirls________inthenextclassroom.[]A.singB.issingC.aresingingD.sings...
Listen! The girls ________ in the next classroom. [ ]
A. sing B. is sing C. are singing D. sings 展开
A. sing B. is sing C. are singing D. sings 展开
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