从A、B、C、D四个选项中，选出可以填人空白处的最佳选项，并在答题卡上将该项涂黑。
例：It is generally considered unwise to give a child he or she wants.
A．however B．whatever C．whichever D．whenever
答案是B。
21．—It seems that Westerners seldom give their friends financial help．
—Maybe．For them ____ friendship is mostly ____ matter of providing emotional support and spending time together．
