So much had changed, so many things had been______, and we tried so very hard to maintain the bond that ties.(alter)

[试题]H．ad they not been working so hard，they______(not achieve)so much.

The living conditions on the deserted island were really hard; they had so much

If we had taken such effective measures much earlier, the river __________so ser

We have been practicing for so long and so hard that our team should ____ winnin

So many directors( ), the board meeting had to be put off.A. were absentB. been

So many directors （）, the board meeting had to be put off.A. were absentB. been

[单选题]The machinery had been wrecked so efficiently that police were sure it was

[单选题]The machinery had been wrecked so efficiently that police were sure it was

[单选题]The machinery had been wrecked so efficiently that police were sure it was

[单选题]The machinery had been wrecked so efficiently that police were sure it was