In the past half-century, average incomes _______ quickly in developed countries, yet happiness levels have remained almost the same.
A．have risenB．had risenC．roseD．rise
A
考查時態(tài)。根據(jù)時間狀語In the past half-century在過去的半個世紀(jì)，可知用現(xiàn)在完成時，選A。
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