severaltimes，buthestilldoesntk

________ several times，but he still doesn't know how to do it correctly.

A．Although I've taught him

B．I've taught him

C．Having been taught

D．Having taught

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相关试题

.---I’m going to the States for further study.
---How long ____ you ___there?

A．had , stayed

B．did, stay

C．have, stayed

D．are, staying

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. I, who, ________your classmate, will support you forever.

A．am

B．is

C．are

D．be

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--- Are your parents doctors, too?
--- No, they are teachers. of them loves teaching very much.

A．None

B．Both

C．Either

D．Neither

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I’m new here. Could you tell me , please?

A．when does the first bus arrive	B．when the first bus arrives
C．when did the first bus arrive	D．when will the first bus arrive

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-Would you like me to go together with you?
-Yes, _________.

A．I'd like to	B．I'd like
C．please do	D．I like it very much

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