5.I don't know why the manager didn't reply.He ________ not have received our letter.( )
A. | must | B. | should | C. | need | D. | might |
4.--Bob,You ________ have posted those letters.
--Sorry.I forgot it.( )
--Sorry.I forgot it.( )
A. | can | B. | should | C. | must | D. | may |
3.--That woman has been taking care of the two white tigers for 8years.
--Oh,dear!She ________ a lot of difficulties!( )
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--Oh,dear!She ________ a lot of difficulties!( )
A. | could go through | B. | might go through | ||
C. | ought to have gone through | D. | must have gone through |