mecompletelywhenIsai的精選

問題詳情：—WhydidMikeignore(不理睬)mecompletelywhenIsaidhellotohim?—Oh,hewaskeeping________aproblem.A．thinkabout           B．tothinkaboutC．tothinkingabout  D．thinkingabout【回答】D知識點：動詞...