10. Where and how they found the boats with treasures made known up to now.
A. hasn't been B. haven't been
C. wasn't D. weren't
10. A考查動詞時態和主謂一致。句意：他們是在哪里以及是怎樣發現那些裝滿寶物的船只的，到現在為止還不為人所知。時間狀語up to now (到目前為止）是現在完成時的標
志，故排除C、D。由于主語是單個主語從句（where and how they found the boats with treasures)，所以謂語動詞用第三人稱單數。因此選A。
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2. We won't start the work until all the preparations .
A. are being made
B. will be made
C. have been made
D. had been made
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1. Sofia looked around at all the faces: she had the impression that she most of the guests before.
A. has seen B. had seen
C. saw D. would see
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8. ―You must have enjoyed using your new camera on your trip.
―I would have, but I it in David's car when he drove me to the airport.
A. had left B. have left
C. leave D. left
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6. ―May I smoke here?
―If you ______， choose a seat in the smoking section.
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3. 你可以和她一起去，也可以待在家里，這完全取決于你自己!
You ____________ at home. It all depends on yourself!
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6. Mr Wang told us that he would devote all the time he could spend his oral English before going abroad.
A. improve B. to improve
C. improving D. to improving
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