MCQOPTIONS
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| 1. |
/**//**/Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select No substitution required.The cause of the disaster has not yet known but an enquiry has been set up to find out what happened. |
| A. | have not yet been known |
| B. | was not yet known |
| C. | No substitution required |
| D. | is not yet known |
| Answer» E. | |