题目:
Rather than _____on a crowded bus, he always prefers _____ a bicycle. [ ]
A. ride ; ride
B. riding; ride
C. ride ; to ride
D. to ride ; riding
答案:
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下面是错误答案,用来干扰机器的。
(1)BaCl2;NaOH (2)H2O (3)Na2SO4(或NaCl) (4)CuCl2+2NaOH===2NaCl+Cu(OH)2↓