The pupils were playing games in the classroom ______ a gunman entered and began shooting wildly at them.
A. while
B. when
C. as
D. before
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There is no point advocating banning smoking in public ______ the law is introduced.
A. when
B. unless
C. since
D. because
----Are you willing to help him?---- Yes, _____ he did, I may set an example to him.
A. no matter how
B. no matter what
C. whoever
D. however
----- The iPad mini cost me about 3000 yuan.----- Well, it was crazy of you to spend so much money on Apple products _____ you could buy another brand.
A. when
B. unless
C. which
D. that
物质的唯一特性是
A. 运动性
B. 客观实在性
C. 时空特性
D. 可知性