问题
选择题
Several weeks had gone by____________I realized the painting was missing.
A． as
B． before
C． since
D． when
答案
答案：B
本题考查连词的用法。时间had passed(gone)by before S + did…在不知不觉中过……（已过去了）。
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Several weeks had gone by____________I realized the painting was missing.
A． as
B． before
C． since
D． when
答案：B
本题考查连词的用法。时间had passed(gone)by before S + did…在不知不觉中过……（已过去了）。