题目内容

--- the dog a bone? ---- Yes, it's eating a bone.

A. Is, eat
B. Is, eating
C. Is, ate
D. Are, eating

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----What __ your mother _? ----She is making the bed.

A. is, done
B. is, do
C. is,doing
D. are, doing

Look, Sandy _____ the door.

A. is shutting
B. is shuting
C. is shut
D. are shuting

Must we ______ the floor?

A. sweeping
B. sweep
C. swept
D. be sweeping

--- Sally under the tree? --- Yes, she is.

A. Is, sat
B. Is, siting
C. Is, sitting
D. Are, siting