She had just finished her homework ____ her mother asked her to practice playing the piano yesterday.
A．whenB．whileC．a(chǎn)fterD．since
A
考查連接詞。根據(jù)主從句的動詞時態(tài)可知主句謂語動詞的動作在從句謂語動詞之前已經(jīng)完成，引導(dǎo)詞的意思是：當(dāng)……的時候，選A。
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