单项选择题

Seldom ()my manager in such good mood since I worked in this company.

A. do I see
B. I have seen
C. have I seen
D. I saw

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单项选择题
They ()in spite of the extremely difficult conditions.

A. carried forward
B. carried out
C. carried on
D. carried off
单项选择题
The mountains also prove to be a tourist attraction as some of the mountains experience alpine (高山的) conditions, () leads to ski resorts.

A. who
B. which
C. it
D. that
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