With a lot of tough problems _____, the
题型:选择题
问题:
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
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