Jack and Susan _______ each other since they were children, so nobody was surprised to hear that they were married.

A. knew          B. had known        C. have known    D. were known

 Jack and Susan ________ each other since they were children, so nobody was surprised to hear that they were married.

A. knew         B. have known    C. had known     D. were known

用括號(hào)內(nèi)所給動(dòng)詞的適當(dāng)形式填空，并將答案寫(xiě)在答題卡標(biāo)有題號(hào)的橫線上。
【小題1】Many great changes ____________ (take) place in China during the past 10 years.
【小題2】We should think about all we can do ____________ (prevent) animals and plants from becoming endangered.
【小題3】Today, to hold the Olympic Games ______________ (consider) as a rich prize for a country.
【小題4】The engineers ____________ (search) for some information on the Internet in the laboratory when Mr. White arrived.
【小題5】Jack and Susan ____________ (know) each other since they were children, so nobody was surprised to hear that they got married.
【小題6】He promised that he ___________ (not forget) to hand in his report before weekend.
【小題7】The patient jumped excitedly when he heard his illness could ______________ (cure).
【小題8】We should try out best to stop those factories ____________ (pollute) the rivers again.