Hemusthavebeenworkingreallyhar

He must have been working really hard these days. This morning, I even noticed ______ behind his ears.

A．grey hair

B．grey hairs

C．the grey hair

D．much grey hair

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A．where

B．in which

C．when

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--I guess so. It’s not difficult after all.

A．should

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A．demand

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A．grateful

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C．reasonable

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—Do you like working as a waiter?
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A．with

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