1____so she had to be sent to the hospital。
A Being ill B Her mother was ill
C Her mother being D Having been ill
2 He has lived in London for three months,during___time he learned some English。
A this B which C that D same
3 When you talking to an older person you shouldn't sit down if___stands。
4 How will we change by 2050___on the development。
A depend B depending C depends D depended
拜托大家给出答案,并尽量说出原因。
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