问题

The electric lamp ____ by Edison.
A:was invented
B:is invented
C:was invent
D:invented;
B:is invented
C:was invent
D:invented;
正确答案是:
同类题型
Many students like Miss Wang.—That’s ________her classes are lively and interesting.
nderful to go away for a month, _____all worries and responsibilities!
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