单项选择题

We were told that we should follow the main road ______ we reached the central railway station.

A. whenever
B. until
C. while
D. wherever
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单项选择题
______ good use you've made of your time to study, there's still room for improvement.
A. Whatever
B. However
C. Though
D. That
单项选择题
Mr. Hal! understands that ______ maths has always been easy for him, it is not easy for the students.
A. unless
B. since
C. although
D. when
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