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【单选题】
四等水准测量某测站累计前后视距差为6 m,则下一站前后视距差为()m,可以满足观测要求。A.
-4
B.
5
C.
-6
D.
6
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反馈参考答案：
举一反三
【单选题】Before she went abroad she spent as much time as she could ______ English.
A.
practise to speak
B.
practising speaking
C.
practise speaking
D.
to practise speaking
【单选题】What did Laura do before she went to college?
A.
She went to travel.
B.
She went to work.
C.
She just stayed at home.
D.
She did volunteer jobs.
【简答题】How did Jane spend her days before she went back to work?
【单选题】She _____ the door before she went away.
A.
had locked
B.
is locking
C.
has locked
D.
was locking
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