【題目】(2013浙江臺州)—Sam，let’s go and play basketball．

—Not now．I ________ Dick with his English．

A．help

B．helped

C．am helping

D．have helped

【答案】C

【解析】根據(jù)“Not now”可知設(shè)空句要使用現(xiàn)在進行時態(tài)，即be＋動詞的現(xiàn)在分詞形式。所以答案選C。

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