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單項選擇題

If you （） the equipment more carefully before sail, we （） so much trouble now.

A.examined；are not having
B.had examined；would not have
C.had examined；would not have had
D.should examine；would not have

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單項選擇題

We’ve tried many ways, but all in vainOnly in this way, （） the problem, I’m sure.

A.can we solve
B.we can solve
C.we will solve
D.can we solved

單項選擇題

Let H （） the quantity of heat which has been converted into mechanical work.

A.represent
B.represents
C.representing
D.being represented

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