问题

I took mathematics and physics because I think that _______very important for me to make furtherresearch in this field.[ ]

A: that is
B: they are
C: this
D: which are

正确答案是：

同类题型

.Finally, the firemen put out the fire.

Sit down, please! . —_______________.

下列词语中,没有错别字的一项是

Did the naughty boy break the glass by chance? —No, ________

d I see Doctor Huang tomorrow” the patient asked.—“ ” the nurse said politely, “He is only available today since this evening he will fly to Boston for a three-day meeting.”