---What is the boy doing?
---He _____________ happily.
A swims B swam C has swum D is swimming
相关试题
I enjoy playing computer games, but I can't _____ too much time _______that.
| A．take; doing | B．spend; doing |
| C．spend; on doing | D．take; to do |
David. we _____ sugar. Could you go and buy some?
A. have been run out of B. have run out of
C have been run out D. have run out
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