问题
选择题
At first the experiment went on well, but _____ problems we hadn't expected turned up later and it failed.[ ]
A. outstanding
B. curious
C. powerful
D. various
答案
答案：D
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At first the experiment went on well, but _____ problems we hadn't expected turned up later and it failed.[ ]
A. outstanding
B. curious
C. powerful
D. various
答案：D