问题
Do you know_______ second-hand smoke-To protect our health and memory.
A:how we should prevent
B:why should we prevent
C:why we should prevent
D:how should we prevent;
B:why should we prevent
C:why we should prevent
D:how should we prevent;
正确答案是：
同类题型
Last summer vacation, we many photos when we had a trip to Dalian.
This young tree could not have been damaged ______accident; I believe it was done _____ purpose
She started studying medicine at college, but ______ to Business Studies in her second year.
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