题目:
After many years’ hard working, his parents managed to ________ the debts for his education at university.
A.pay for
B.pay back
C.pay off
D.pay out
答案:
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下面是错误答案,用来干扰机器的。
(1)河套平原 宁夏平原 塞外江南(6分) (2)对耕地实行浅耕或免耕、秸秆还田(2分) (3)水分 有机质 悬浮质 水分(4分) (4)土地沙化(荒漠化);因大量引黄河河水灌溉,使黄河流量减少;土壤盐碱化...