the old lady used to_under a big tree,waiting for her _ son to come back
A:sit;missing
B;sitting:missed
C;sit:missed
D;sitting:missing
人气：497 ℃ 时间：2020-03-28 10:26:14
解答
A
used to do 过去常常
be used to doing 习惯做……
be used to do 被用来做
a missing boy 一个失踪的男孩
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