单项选择题

The country's chief exports are coal, cars and cotton goods, cars ______ the most important of these.

A. have been
B. are
C. being
D. are being
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单项选择题
I must leave now. ______ if you want that book I'll bring it tomorrow.
A. Occasionally
B. Accidentally
C. Incidentally
D. Subsequently
单项选择题
I could find my umbrella nowhere. I ______ it in the taxi.
A. should leave
B. must have left
C. could leave
D. should have left
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