There _____an old tree here. I wonder how they could manage to remove such an old tree.

 There _____an old tree here. I wonder how they could manage to remove such an old tree.

#103670

seemed not

not seemed

didn’t seem to be

didn’t seem to have

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（2010·重庆模拟）—Alice, you look puzzled．Haven’t you understood it? —Yes．I _____of another problem just now．

#102848

had thought

have thought

thought

was thinking

In the past several weeks, many cities in Northern China        from heavy fogs and  severe cold.

#99857

had suffered

have been suffering

were suffered

suffered

It was for the first time that the two countries ______ an agreement.

#100479

reached

have reached

had reached

will reach

–Why do you know so much detail about the accident? --I ________ a walk nearby when it happened.

#99509

had

had had

was having

would have

 Since last year I____ him only once.

#103740

have seen

have been seeing

see

was seeing

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