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Sam is doing some   about the ancient Silk Road.(  ) A.exercise B.operations C.research D.experime...

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doing        making       carrying       putting  
They are exciting  They are too hard for me  Good idea  Well done  
to do    doing    do    does  
to    to have    to do so    doing so  
to do    doing    do    does  
Sam and she    Sam and you    you and Sam    he andI.  
B.C.D.中选出一个能填入句中空白处的最佳答案。Sam is doing some ______ about the ancient Silk RoaD.A. exercise    operations    research    experiments  
finished    enjoyed    suggested    practised  
He _______ it this morning.A.did  has done  was doing  had done  

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