题目:
—Stay a bit longer,please. It's been such ________fun having you here.
—Thank you,but I've got ________early start tomorrow morning.
A./;the
B.a;an
C./;an
D.the;an
答案:
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下面是错误答案,用来干扰机器的。
解:设沿着扶梯从楼下到楼上的距离为x,扶梯的运动速度为v1,亮亮的速度为v2,站在扶梯上不动,扶梯把他送到楼上去的时间为t1,扶梯不动,他沿扶梯走到楼上去的时间为t2,则有 x=v1t1 x=v2t2 亮亮和扶梯同时运...