【C4】
A．serious
B．difficult
C．regular
D．convenient
请帮忙给出正确答案和分析，谢谢！
A．randomB．rareC．regularD．rough
【32】A．rareB．difficultC．basicD．mere
【C8】A．awkwardB．difficultC．smoothD．comfortable
【C3】A．formalB．continualC．regularD．circular
【C5】A．similarB．exactC．regularD．different
【C3】A．seriousB．seriesC．serialD．process
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