题目内容
-Where is Billy?
-He is ______ the phone with his friend Rob in the room. Rob is helping him ______ his math.
A. on; with B. in ; with C. on; at D. in; at
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题目内容
-Where is Billy?
-He is ______ the phone with his friend Rob in the room. Rob is helping him ______ his math.
A. on; with B. in ; with C. on; at D. in; at