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單項選擇題

When workers are organized in trade unions, employers find it hard to lay them（）

A.off
B.side
C.out
D.down

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單項選擇題

It’s more （） to buy a season ticket if you travel every day.

A.cheap
B.economic
C.economical
D.saving

單項選擇題

To study a foreign language,（）

A.a good dictionary should be bought
B.buying a good dictionary is necessary
C.you should buy a good dictionary
D.it is necessary that you will buy a good dictionary