To be a successful criminal, one must be（）
A. empirical
B. emigrant
C. elegant
D. elusive
There is no clear proof from which we can draw the conclusion () the financial crisis will soon end.
A. what
B. which
C. that
D. whether
操作热压灭菌柜时应注意的事项中不包括
A. 必须使用饱和蒸汽
B. 必须将灭菌柜内的空气排出
C. 灭菌时间应从开始灭菌时算起
D. 灭菌完毕后应停止加热
E. 必须使压力逐渐降到零才能放出柜内蒸汽
The naughty boy had been told that whether () his ball or not was still under discussion.
A. get back
B. will get back
C. getting back
D. to get back
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