题目内容
Be quiet! I ______ my homework.
| A．amdoing | B．havedone |
| C．do | D．did |
A
解析试题分析：句意：请安静！我正在做作业。结合语境可知本句描述的是现在正在进行的动作，故用现在进行时态，选A。
考点：考查时态辨析
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