a smile appeared on his face这里appear为什么要用过去式?

A smile appeared on her face是主系表吗 A big smile appeared on his face.这里的appeared什么意思？ Gradually a smile ____ on her face.a、appearing b、appeared c、being appearing d、is appeared a smile appeared on his face这里appear为什么要用过去式? After he worked out the solution,appeared a smile on his face.A.it B.here C.what D.there Reading the letter from her boy friend,____ A.a smile appeared on her face.B.she began to smil...Reading the letter from her boy friend,____A.a smile appeared on her face.B.she began to smile应该是B,为什么A不能选?语法上有什么错? with a smile on his A smile ( ) on his face. paint a smile on his on a smile 还是 with Hearing the high compliment on his newly published book,___ smile appeared on the scolar's face.A.the old same B.the same old C.old the same D.same the old为什么选的是B? with a smile on the face还是with a smile on one’s face wear a smile on one's face与with a smile on one's face there appeared on the horizon a man on horseback ,riding in my direction have a good sleeping和put a smile on your There is -a---- a charming smile on his face suddenly a snake appeared...and bit him on the hand.这句话是什么意思? there was a pleasant smile on his face为什么smile不用过去式?