Mary ________ her homework when Jean knocked at the door．

[　　]

A．was doing

B．did

C．had done

D．has done

答案：A
解析：

選A。when引導(dǎo)的時(shí)間狀語(yǔ)從句，連接兩個(gè)動(dòng)作，其中持續(xù)較長(zhǎng)的動(dòng)作用過(guò)去進(jìn)行時(shí)，較短的動(dòng)作用一般過(guò)去時(shí)，表示在一個(gè)動(dòng)作發(fā)生的過(guò)程中，另一個(gè)動(dòng)作發(fā)生了。


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