{01}We were told that we should follow the main road _____ we reached the central railway station .
A.whenever
B.until
C.while
D.wherever
解析：
本题选B。
{02}You must keep on working in the evening _____ you are sure you can finish the task in time.
A.as
B.if
C.when
D.unless
解析：
本题选D。
A.whenever
B.until
C.while
D.wherever
解析：
本题选B。
{02}You must keep on working in the evening _____ you are sure you can finish the task in time.
A.as
B.if
C.when
D.unless
解析：
本题选D。
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