题目内容

Look! The aeroplane ________ over the river.

A. flying
B. is flying
C. fly

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It is eight o'clock. The keyboard operator ________ a letter.

A. type
B. are typing
C. is typing

--- ______ they _____ the dishes? --- Yes, they are.

Are, washing
B. Is, washing
C. Do, wash

They ______ now.

A. is shaving
B. are shaving
C. shaving

---What ____ Mr. Jones ____ ? ---He is walking over the bridge.

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

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