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has joined has been joined have joined have been joined
might be may have been should have been could be
is paid back have been paid off has been paid off are paid off
have has have been has been
have, come to have, been to have, been in have, gone to
have taken have been taken had been taken had taken
are rescued were rescued have been rescued had been rescued
are used to living are used to live have been used to living have been used to live
is loaded are loaded have loaded have been loaded
By far So far As far as Far from
virus subtypes(子类型) have been found in pigs. A. By far As far as So far Till far
so far；making so far not；to make up to now；made till now not；makes
joined have joined join have been in
have been completed has been completed has completed have completed
virus subtypes(子类型) have been found in pigs. A. By far As far as So far Till far
that has been what have been which has been that have been
have been completed has been completed has completed have completed
is, is eaten are, have been eaten are, are eaten is, have been eaten
have; come to have; been to have ; been in have; gone to
isn’t weren’t hadn’t been shouldn’t have been
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