we are busy ( )our lessons these days.a ,prepare!b,preparing c,to prepare d,prepared

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we are busy ( )our lessons these days.a ,prepare!b,preparing c,to prepare d,prepared
we are busy ( )our lessons these days.a ,prepare!b,preparing c,to prepare d,prepared

we are busy ( )our lessons these days.a ,prepare!b,preparing c,to prepare d,prepared
b,preparing

B
be busy doing

preparing
busy doing

答案B

B

b,preparing
be busy doing sth 正忙于做某事

B

preparing
busy doing

B