单项选择题

A friend of mine returned to his house after a holiday, only to find it（）broken into.

A、 to be
B、 had
C、 was
D、 had been

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单项选择题
（）, such problems concerning environment protection are not as easy to solve as they look.

A、 Speak generally
B、 To speak generally
C、 Generally speaking
D、 General speaking
单项选择题
My boss asked me to answer the phone, to take all messages, and（）some letters.

A、 to type
B、 typing
C、 type
D、 typewrite
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