He stood up,      the large door and looked outside. There on the ground lay a white dog.
A．opensB．openedC．openingD．having opened
B
考查時態(tài)。句意：他站了起來，打開大門向外看�？芍揪涫遣⒘兄^語，前面謂語為過去時態(tài)，故本也為過去時態(tài)，選B。
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