He was observed ________ into the house and helped himself to find what he liked before the owner came back．
- A.
to slip
- B.
slip
- C.
slipping
- D.
slipped
A
本題考查observe的用法．observe sb．do sth．用于被動(dòng)形式時(shí)，要加不定式符號(hào)to，即sb．be observed to do sth．B項(xiàng)前沒有to; C、D項(xiàng)也都不符合這一用法．
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