In 1900 the world had no deaths from rabies. Scientists_____ wonderful vaccine.
A. has discovered B. discovered
C. must have discovered D. should have discovered
Đáp án C
Cấu trúc câu dự đoán: must + have + p2
Diễn tả một hành động chắc chắn đã xảy ra trong quá khứ và có chứng cớ rõ ràng
She _________ , but luckily , a lifeguard spotted her and rescued her.
A. has drowned B. ought to drown C. could have drowned D. might drown
I would rather_____ poor but happy than become rich without happiness.
A. being B. be C. to be D. was
You're having a sore throat. You'd better_____ to the doctor.
A. to go B. went C. go D. going
He spent all that money last week. He_____ so much.
A. didn't need spend B. didn't need spend
C. needn't have spent D. didn't have to spend
He _____ all that money, so he could save some.
A. didn't need to spend B. needn't have been spent
C. shouldn't spend D. oughtn't to spend
I'd rather_____ in the field than_____ home.
A. to work/ to stay B. work /stay C. working/ staying D. worked/stayed
She told me that she'd rather______ on the committee.
A. not to serve B. not serving C. not serve D. serving not
The yard is wet. It______ last night.
A. must rain B. must have rain C. must have rained D. had to rain
We are now wet. You______ the raincoats with you.
A. should bring B. should have brought C. must bring D. have to bring
She _______ to refill the petrol tank.
A. stop B. stoped C. stopped D. stoppen
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