题目内容

Electricity was ____________ many, many years ago.

A. invented
B. created
C. discovered
D. composed

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Jane is the only student in the class _______ got full marks in the exam.

A. which
B. who
C. that
D. whom

Although these changes _________ us, they may have negative impacts on the environment.

A. harm
B. hurt
C. damage
D. benefit

_______nobody was very enthusiastic about it, they decided to cancel the trip.

A. See that
B. Seeing that
C. Seen that
D. To see that

But for the worker’s help, we _______ .

A. shouldn’t succeeded
B. couldn’t have succeeded
C. won’t succeed
D. couldn’t succeed