－Where have you been these days？－（)。

You should have been more patient ________ that customer; I’m sure that selling him the watch was a possibility.

A) of B) with C) for D) at

with artificial intelligence, _________ and perfected now.

A) developed B) have developed

C) are being developed D) will have been developed

22 This ticket _________ you to a free meal in our new restaurant.

’s been out of town for two weeks.

A) needn’t have seen B) must have seen

C) might have seen D) can’t have seen

I've never been to Beijing, but it's the place _______.

A) where I'd like to visit B) in which I'd like to visit

C) I most want to visit D) that I want to visit it most

ned.

A) can’t have been B) mustn’t have been

C) shouldn’t have been D) wouldn’t have been

ts to the moon.

A) to send B) to be sending C) to have sent D) to have been sending

A.have been given

B.have given

C.give

D.given

Deserts and high mountains have always been a ______ to the movement of people from place to place.

A) barrier B) fence C) prevention D) jam

ing hand.

(A) Not being (B) Had it not been (C) Without being (D) Not having been

.

(A) done (B) be done (C) having done (D) to have been done

he breaks traffic regulations.

(A) having been fined (C) to have been fined

(B) to be fined (D) being fined