单项选择题

Having (finished) his term paper (before the deadline), (it was delivered) to the profes-sor (before) the class.（）

A. finished
B. before the deadline
C. it was delivered
D. before

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(Although) the danger that he might (be injured), Smith (bravely entered) the burning house (in order) to save the boy.（）

A. Although
B. be injured
C. bravely entered
D. in order
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(The atmosphere) (is consisted) of certain gases (mixed together) (in) definite proportions.（）

A. The atmosphere
B. is consisted
C. mixed together
D. in
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