________ people used the computer thirty years ago, but now it’s very popular.
You are not supposed ________ in public. A. smoking B. to smoke C. to smoking
--- Jack, I haven't seen your brother for a long time. --- He _______ Shanghai on business for two months. A. has gone to B. has been in C. has been to
—Do you have a knife? —Yes, I do. I have a big . A. / B. ones C. one
下列字母书写格式正确的是 ________。 A.B.C.
当你被介绍认识某人后, 你应该说: “____”. A. Good morning!B. Thank you! C. Nice to meet you!