Behind___house there is _tree.(填介词）

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Behind_______house there is _____tree.
(填介词）

the a

Behind_______house there is _____tree.(填介词） T T “T “T T T^T T^T T T T^T T^T T^T T^T T T while(*t)t++; t--; T.....T.T.. 求大神救我!T^T T^T T^T 13-20t+4t*t*t-20t*t*t*t=0,求t?