—Who’s singing over there — ________ is Sandy’s sister.
问题描述:
—Who’s singing over there — ________ is Sandy’s sister.
答
it 一般如果事先不知道性别的话,用it.仅供参考.
—Who’s singing over there — ________ is Sandy’s sister.
it 一般如果事先不知道性别的话,用it.仅供参考.