21. Tom as well as his classmates _____ Japanese in
A. are studying B. have studied C. studies D. study
22. –Why, I couldn’t get you on the phone this morning.
--We _____ tennis in the yard when you called.
A. must be playing B. could be playing
C. must have played D. must have been playing
23. –There were already five people in the car but they managed to take me as well.
--It _____ a comfortable journey.
A. can’t be B. shouldn’t be C. mustn’t have been D. couldn’t have been
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