.Look!They are swimming __________ the riverA in middleof B in the middle of

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.Look!Theyareswimming__________theriverAinmiddleofBinthemiddleof.Look!Theyareswimming__________theri

.Look!They are swimming __________ the riverA in middleof B in the middle of
.Look!They are swimming __________ the river
A in middleof B in the middle of

.Look!They are swimming __________ the riverA in middleof B in the middle of
B本文中表示特指the river,所以应该有the

in

选A

Look! They are swimming __in the middle of ________ the river

B