Be quiet! I ______ my homework.

A．a(chǎn)mdoingB．havedone
C．doD．did

A

解析試題分析：句意：請安靜！我正在做作業(yè)。結合語境可知本句描述的是現(xiàn)在正在進行的動作，故用現(xiàn)在進行時態(tài)，選A。
考點：考查時態(tài)辨析

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