单选题 It will be emphasized that commercial space operations are inherently complex, long-term, capital-hungry, and set by a variety of risks.

A、 beset by
B、 inset by
C、 preset by
D、 reset by

【正确答案】 A

【答案解析】[分析] 动词搭配 beset (后面常与by连用)困扰；inset插页，插入，嵌入(一般不与by连用)；preset预先安置，预先调试，事先调整；reset重新安排；后．面三个词大都作及物动词；而本句意为：需要强调的是民用太空计划是复杂，耗时长，资金缺且风险重重。因此A为答案。