______ more attention,the trees could have grown better.
A.To give B.Having given C.Given D.Giving
C
The first textbooks ______ for teaching English as a foreign language came out
in the 16th century.
A.to be written B.written C.being written D.having written
B
The missing boys were last seen ______ near the river.
A.to play B.play C.to be playing D.playing
D
______ in thought,he almost ran into the car in front of him.
A.To lose B.Lost C.Having lost D.Losing
B
When passing me he pretended ______ me.
A.to see B.not having seen C.to have not seen D.not to have seen
D
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