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问题

They had much difficulty ____________ the problem and they needed our help.

A:working out
B:work out
C:worked out
D:to work out;
正确答案是:
同类题型

.In the market near our school, there are ______ supplies of fruits, fish and meat. You can buy whatever you like.

Jane , is there ______in today’s newspaper —No, nothing.

hole process for the studies of cancer took morethan a year, the technology is moving so fast that it will soon take just weeks.

Hello, may I speak to Millie, please—________.

There are ____ people in the train.

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