PART TWO: LANGUAGE KNOWLEDGE
Section A
Directions: Beneath each of the following sentences there are 4 choices marked A, B, C and D. Choose one answer that best completes the sentence.
21. Trees are useful to man mainly in three ways, the most important of which is that they can protect ______ from droughts (干旱) and floods.
A. it B. itself C. himself D. Him
He works in a factory now, but he on a farm for 20 years.
| A．worked | B．has worked | C．had worked | D．had been working |
Glad to see you back. How long in Russia?
| A．did you stay | B．have you stayed | C．were you staying | D．have you been staying |
---Have you decided already?
---Yes, I at once.
| A．have decided | B．decided | C．will decide | D．had decided |
--I’ve bought a box of chocolates for our daughter.
---Oh, how good a dad! But she doesn’t like sweet things, that?
| A．Don’t you know | B．Haven’t you known |
| C．Didn’t you know | D．Hadn’t you known |
---Answer the doorbell, please. It must be your uncle.
---It Heidi. She’s coming over this morning to help me with my math.
| A．is | B．can’t be | C．could be | D．will be |