问题

The secretary worked late into night, ________ a long speech for the president.

A:to prepare
B:preparing
C:prepared
D:was preparing;

正确答案是：

同类题型

They lived a life in the countryside

ays to praise your children often,_________ you’ll find they will open their hearts to you

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－ Were you busy this weekend?－ Very, instead of playing games _____, I devoted myself to going over my lessons [ ]

____________ great fun it is to have a picnic on such a warm sunny spring day!