I don’t know ( ).

[单选题]（ ）I don’t know __________.A．how often he visits his grandparentsB．how soon will he come backC．how many students are there in his classD．how long is the bridge

[单选题]I don't know ________.A.who were theyB.who they areC.who are theyD.who they

[单选题]I don’t know ______ to deal with such matter.A.whatB.howC.whichD./

I really dont knowA. where to chooseB. which to chooseC. to choose whatD. to cho

I really dont know()A. which to chooseB. to choose whatC. what to chooseD. to ch

[单选题]I don't know ______ standing beside the headmaster.A． the girl's nameB． the name of the girl'sC． the name of the girlD． the name's of the girl

[单选题]I don't know his address, ______.A．otherwise I will write to himB．otherwise I would write to himC．otherwise I had written to himD．otherwise I would have written to him

[单选题]I don't know ________ to deal with such matter.A.what B. how C. which D. /

[单选题]I don't know _________ to deal with such matter.A.what B.how C.which D./

[单选题]I don't know ________ to deal with such matter.A.whatB.howC.whichD./