Question

【题目】There used a tree in front of the house, but now it is cut down.
A.be
B.have
C.to be
D.to have

Answer 1

【答案】C
【解析】句意：过去房子前面曾有一个树，但是现在被砍倒了。这是一个there be结构的句子，其主要动词一定是be的恰当形式，B、D错。过去常常：used to +动词原形。故选C。