单项选择题

He didn’t to return earlier than 3 o’clock.()

A. was not expected
B. did not expect
C. was expected not
D. was not expecting

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

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

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These data will be of considerable use for identifying and analyzing environmental degradation, and than crafting workable solutions（）.

A. /
B. from
C. with
D. to

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