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【单选题】
更换道岔和岔枕时，应（）更换为新道砟。A.
全部
B.
视情况而定
C.
部分
D.
大部分
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反馈参考答案：
举一反三
【单选题】— I went to your home yesterday afternoon, but your mother was alone at home. — Oh, I'm sorry. I ______ football with my classmates at that time. [ ]
A.
play
B.
played
C.
was playing
D.
have played
【简答题】（ ）是影响期权价格的最重要因素。
【单选题】—I wonder ______. —On Guoqing Road.
A.
what’s your address
B.
where is your address
C.
what your address is
D.
where your address is
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