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【单选题】
地面上有一点A，取大地水准面，则点A到该水准面的铅垂距离为（）。A.
相对高程
B.
高差
C.
绝对高程
D.
海拔
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举一反三
【单选题】He asked me ▲ the film.
A.
had I seen
B.
have I seen
C.
if I have seen
D.
whether I had seen
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【单选题】“Have you seen the film?” he asked me. → He asked me _______ the film.
A.
had I seen
B.
have I seen
C.
if I have seen
D.
whether I had seen
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