With a lot of tough problems       , the pilot was still calm, cool and collective under pressure.
#96144
A
solve
B
solved
C
solving
D
to solve
推荐题目
The lady spoke slowly, trying to make herself ______.
#95113
A
understand
B
understanding
C
understood
D
to be understood
________ to our study is the best way ________ high grades.
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A
Devote ourselves; to achieve
B
Devoting us; of achieving
C
Devoting ourselves; to achieve
D
Devoted ourselves; of achieving
The secretary worked late into the night,_______ a long, speech for the president.
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A
to prepare
B
was preparing
C
prepared
D
preparing