After the mew technique was introduced ,the factory produced ____in 2001 as the year before.
| A．as twice many machines | B．twice many as machines |
| C．as many machines twice | D．twice as many machines |
—Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
The Smith’s family, which __________ a large one, ____________visit BeiJing this summer.
| A．are, are going to | B．is, are going to | C．is, is going to | D．are, is going to |
My old father began to study computer science at the age of sixty in order that he might ___ times.
| A．come up with | B．keep up with | C．end up with | D．put up with |
—You must be tired out yesterday. —Oh, _____, I worked all day non-stop.
| A．not a bit | B．not at all | C．not a little | D．not nearly |
Lin Feng is said ____ abroad, but I don’t know which country he studied in.
| A．to study | B．to be studied | C．to have studied | D．to be studying |