下列肾脏疾病哪一项不属于肾先天性异常（）
A.重复肾
B.肾发育不良
C.马蹄肾
D.肾自截
E.异位肾
参考答案：D
单式记账凭证便于分工记账，而复式记账凭证不便于分工记账。
It ____him half an hour to do his homework every day.
A．take
B．took
C．takes
D．taking
