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B. is spoken
C. was spoken
D. will be spoken
[2]. The lost boy ____ at the street corner last night.
A. was found
B. is found
C. was looked for
D. found
[3]. More man-made satellites ____ in the future.
A. will send up
B. will be sent up
C. are sent up
D. is sent
[4]. Three bridges ____ since last year.
A. have built
B. were built
C. have been built
D. is been built
[5]. Flowers ____ every day.
A. has been watered
B. should be watered
C. should water
D. will be watered
各种时态的被动情况：
一般现在时：
一般过去时：
现在完成时：
一般将来时：
情态动词变被动：
am / is / are done