Three weeks having gone by, the cause of the accident _____ unknown to the publi

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Three weeks having gone by, the cause of the accident _____ unknown to the public.      [     ]
A. remains
B. is remaining
C. has remained
D. is remained

答案

举一反三

— Roderick had an accident yesterday.
— How come ?He very carefully. [ ]
A. drove
B. drives
C. had driven
D. has driven

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Tom ________ get up late in the past, but now he ________ getting up early. [ ]
A. used to; is used to
B. is used to; used to
C. used to be; used to
D. be used to; be used to be

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Children under sixteen are not permitted to see such kind of films as ________ bad for their mental
development.[     ]
A. was
B. were
C. is
D. are

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Nowadays, the iron and steel industry ________ the key link in socialist production.[     ]
A. is
B. are
C. was
D. were

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______ not only you but also Jack going to China next week?[     ]
A. Are
B. Is
C. Were
D. Was

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