摘要：31．You find it so hard to write the composition now if you had observed life carefully A．don't B．didn't C．wouldn't D．mustn't
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You find it so hard to write the composition now if you had observed life carefully
A．wouldn't B．didn't C．don't D．mustn't
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You find it so hard to write the composition now if you had observed life carefully
| A．wouldn't | B．didn't | C．don't | D．mustn't |