“Isn’t it about time you _____ to do morning exercises?” “Yes, it is. Would you like to join us?”

A. begin　　　　　　　　　　 B. have begun

C. began　　　　　　　　　　 D. had begun

“Isn’t it about time you _____ to do morning exercises？” “Yes, it is. Would you like to join us？”

    A. begin                            B. have begun

    C. began                            D. had begun

“Isn’t it about time you _____ to do morning exercises？” “Yes, it is. Would you like to join us？”

    A. begin                            B. have begun

    C. began                            D. had begun

----Isn’t it about time you _____ to do morning exercises？

----Yes, it is. Would you like to join us？

A. begin　　 B. have begun　　　 C. began　　 D. had begun

“Isn’t it about time you _____ to do morning exercises？”

“Yes, it is. Would you like to join us？”

1. A.
   begin
2. B.
   have begun
3. C.
   began
4. D.
   had begun