问题
选择题
With a lot of tough problems , the pilot was still calm, cool and collective under pressure.
A．solve
B．solved
C．solving
D．to solve
答案
答案：D
本题考查非谓语动词。根据题意可知，问题仍没有被解决，故用不定式，故选D。
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With a lot of tough problems , the pilot was still calm, cool and collective under pressure.
A．solve
B．solved
C．solving
D．to solve
答案：D
本题考查非谓语动词。根据题意可知，问题仍没有被解决，故用不定式，故选D。