[ Grammar ]
Fill the blank with suitable preposition
I have been working hard …….. arithmetic.
A. on
B. at
C. for
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Grammar › ViewI dislike _______ th dishes
A. cooking
B. making
C. washing
D. having
Grammar › View
I lost my keys when I ________ (walk) home.
A. walked
B. walk
C. is walking
D. was walking