问题

Mary had to go to a meeting, so she left her children________at home. [ ]

A: playing
B: played
C: to play
D: having played

正确答案是：

同类题型

There _______be anyone in the classroom. I was the last one to leave and I locked the door.

The little girl was allowed to go swimming ____ she must keep herself near her father

Alfred found _____ difficult to get a driving license.

.I should thank youthat you should thank me.

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