42? She doesn't know ___ .
A. when to do
B. what to do
C. how to do
D. where to do
[答案] B.
[析] when, how, where均为疑问副词,而what为疑问代词,又因do是及物动词需要宾语。如用疑问副词时应为when to do it, how to do it, where to do it.
43? Must older people ___ to politely.
A. speak
B. spoken
C. be spoke
D. be spoken
[答案] D.
[析] 这句话的主动语态应为People must speak politely to older people?对年龄较大的人讲话应有礼貌。
44? Teachers usually ask their students ___ loudly in class.
A. to speak
B. speak
C. speaks
D. spoke
[答案] A.
[析] ask somebody to do something 要求某人作某事。
45? - Where is Mr Zhang?
- Look! He ___ on a big machine over there.
A. works
B. worked
C. is working
D. has worked
[答案] C.
[析] 由look, liston等词开始的句子一般要用现在进行时态。
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