Question

The teacher showed ________ the test.

1. A.
   to do
2. B.
   how to do
3. C.
   what to do
4. D.
   in which to do

Answer 1

B
思路分析：show，teach，know等动词通常不直接跟不定式作宾语，但可跟“疑问词+不定式”作宾语．此空应填how to do，副词how在不定式中作方式状语．