单项选择题
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
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Let H （） the quantity of heat which has been converted into mechanical work.
A.represent
B.represents
C.representing
D.being represented -
单项选择题
The chief engineer suggests that the second engineer （） a dead line for handing in the work plan.
A.will set
B.shall set
C.set
D.sets -
单项选择题
After he （） the test, the engineer put down the results.
A.has finished
B.finishes
C.had finished
D.would finish
