单项选择题

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

A.An/the
B.the/the
C.an/an
D.the/an

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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

单项选择题

（）for a long time，the ponds are all dried up and a lot of fish are dead.

A.There has been no rain
B.Having no rain
C.There having been no rain
D.There being no rain