题目内容
（请给出正确答案）
[主观题]
Research has shown that ______.A．dropouts are substantially below Ph.D s in financial atta
Research has shown that ______.
A．dropouts are substantially below Ph.D s in financial attainment
B．the incentive factor is a minor one in regard to pursuing Ph.D studies
C．the Ph.D candidate is likely to change his field of specialization if he drops out
D．about one-third of those who start Ph. D．work do not complete the work to earn the degree
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