Question

Bob would have helped us yesterday, but he-_______

1. A.
   was busy
2. B.
   is busy
3. C.
   had been busy.
4. D.
   will be busy

Answer 1

A
試題分析：考查時(shí)態(tài)：句意：鮑勃昨天本應(yīng)該來幫助的，但是他很忙，說明他很忙是昨天的事實(shí)，是對(duì)過去事實(shí)的陳述，不需要用虛擬語氣。選A。
考點(diǎn)：考查時(shí)態(tài)
點(diǎn)評(píng)：考查時(shí)態(tài)時(shí)，如果有時(shí)間狀語，就充分利用時(shí)間狀語，如果沒有，要結(jié)合上下文找出來。這道題的關(guān)鍵要看清but后面的內(nèi)容是事實(shí)，不能用虛擬語氣。