单项选择题

The dog seems very quiet now，but he still （）go by.

A.dare not to
B.dare not
C.does not to dare
D.dares not

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---Is this（）apple tree？---No，it is（）orange tree.

A.An/the
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单项选择题

He was so（）in his work that he didn ’t notice me entering the room.

A.concentrated
B.focused
C.absorbed
D.attracted