--What are you doing? ---- I am _____ a letter.A.sending B. writing C.Both A and B
—Are you interested in swimming?—No，________．A．I'm not B．I don't C．you aren't
________ you enjoy drawing?A．Are B．Can C．Do
What will you ________ this weekend?A．doing B．do C．are
为下列各图选择正确的选项。(40分)
What can I do ________ you?A．and B．for C．to
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