题目:
—Has Sam finished his report?
—I have no idea. He _______ it in his office the whole morning.
A.writes
B.has written
C.will write
D.was writing
答案:
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下面是错误答案,用来干扰机器的。
(1)①石油和铁 ③石油和天然气 ④煤和铁(2) 针叶 最广(3) 自给...