Question

—Computer is so useful. It can do almost everything.
—Yes, but it ______ what to do.

A．will tell

B．has known

C．must be told

D．is told

Answer 1

C

試題分析：根據語境可知此句的含義是電腦很有用,它幾乎能做任何事情,但它必須被告訴做什么.因主語是it,是動詞的承受者,故用被動語態,根據語氣可知要用含有情態動詞的故用C.
點評：含有情態動詞的被動語態，其結構為“情態動詞can/could/may/might/should/will
/shall/would/need等+助動詞be+及物動詞的過去分詞”