----Can he work out the maths problem?
----I think _____ hard for him to work it out.
| A．it’s | B．that’s |
| C．this is | D．they’re |
----Can he work out the maths problem?
----I think _____ hard for him to work it out.
| A．it’s | B．that’s |
| C．this is | D．they’re |
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