问题

I’m impressed with his determination. When he had a problem to solve, he _____ work at it until he found an answer.

A:would
B:might
C:must
D:should

正确答案是：

同类题型

Many difficulties have____ as a result of the change over to a new type offuel. [ ]

We had planned to finish the work before dark, but we were by a heavy rain. [ ]

nothing on me except this ten yuan to donate, I’m afraid.—Never mind. ________. We really appreciate your assistance.

His girl friend wore D．satisfy[

Is thatyour watch —Yes, ____.